Ovulation calculator

Each woman's menstrual cycle is different, so getting to know your body better can improve your chances of conception.

This ovulation calculator allows you to find out when you'll be most fertile, and what your due date would be if you got pregnant on these dates.

Ovulation calculator

What was the first day of your last period?

What is your average cycle length?

Are you ready to conceive? Take our quick quiz to find out.

For the best chance of getting pregnant, you need to maximise the chance of your fertile egg and your partner's sperm getting together. You can only get pregnant on the few days each cycle around ovulation, when an egg is released.

When is the best time to conceive?

To increase your chances of getting pregnant, you need to get your fertile eggs and your partner's sperm together as often as possible. You can only get pregnant on the few days each cycle around ovulation, when an egg is released.

How does the menstrual cycle work?

  • Your cycle starts on the first day of your period and continues up to the first day of your next period.
  • At the same time, eggs begin to mature in the ovary.
  • The lining of the womb thickens ready for fertilisation.
  • During ovulation your cervical mucus becomes thinner and clearer to help the sperm reach the released egg.
  • About 10 to 16 days before the start of your next period, an egg is released from one of the ovaries (ovulation).
  • If sperm is present at the moment of ovulation, or some time during the next 24 hours, the egg may be fertilised.
  • If the egg has not been fertilised, the egg is re-absorbed by the body, the hormone levels drop, and the womb lining is shed. This is the beginning of your next period.

Read more here about how pregnancy works

Conception and sex

To boost your chances of conceiving, aim to have regular sex throughout your cycle so you know that there should hopefully be good-quality sperm waiting for the time that the egg is released. An active sex life is all most people need to conceive.

If you are quite sure when you ovulate each month you can give yourself the best chance of getting pregnant by having sex in the days leading up to ovulation. Continue having sex during ovulation. After this your fertile time will be over for that cycle.

Taking a pregnancy test? Read about how pregnancy tests work.

How to spot the signs of ovulation

Ovulation usually happens about 10 to 16 days before the start of your next period, so  it helps to know your cycle length before you start trying to conceive.

You may never have considered when you might ovulate within your cycle, and if you have been using a hormone contraceptive such as the Pill, you won’t have had a natural menstrual cycle for a while.

As a first step, mark on your ovulation calendar the dates that you bleed during a period. You can then count how many days from the first day of your period to your next period to work out the length of your cycle.

Cervical mucus changes

The cervix secretes mucus throughout the menstrual cycle, starting off sticky white and gradually becoming thinner and clearer.

Before and during ovulation the mucus increases and becomes much thinner, slippery and stretchy. Women often compare it to raw egg white.

This thinner mucus is designed to help the sperm swim easily through it. It indicates that you are in your fertile phase, so this is the time to have sex if you want to get pregnant, but use contraception if you do not!

The last day you notice the wetter secretions is sometimes known as ‘peak day’ and for most women this occurs very close to the time of ovulation.

Temperature

You can also find out about your menstrual cycle by keeping a note of your temperature each morning when you wake up. Your temperature rises by about 0.2°C when ovulation has taken place.

As it is only an indicator that you have ovulated, and doesn’t tell you when your fertile time starts, this is not very useful for most women.

Using ovulation test kits (also known as ovulation predictor kits)

Ovulation predictor kits are available from chemists and are fairly simple to use. They work by detecting a hormone in your urine that increases when ovulation is about to take place.

The simplest ovulation test kits check for luteinising hormone (LH), which surges 24-36 hours before ovulation. This will help to identify the best two days for conception, although a woman can be fertile for a day or so before and after this time.

It is best to become familiar with your usual menstrual cycle to help figure out when you should start testing. If you have an irregular cycle then an ovulation predictor kit can help you identify the time of ovulation, but expect to use more of the test strips.

 

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Sources

  1. Macdonald S, Macgill-Cuerden J (2012) Mayes’ midwifery: a textbook for midwives, 14th edition, London Balliere Tindall

 

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    Comments

    Please note that these comments are monitored but not answered by Tommy’s. Please call your GP or maternity unit if you have concerns about your health or your baby’s health.
    • By Midwife @Tommys on 11 Apr 2018 - 09:04

      Hi there. It might be sensible for you to call us on 0800 0147800 as we will need more information from you to be able to fully answer your question.
      Look forward to hearing from you.
      Sophie, Tommy's Midwife

    • By Kloie (not verified) on 7 Apr 2018 - 22:09

      I had my period March 31 to April 3 I had unprotected sex during period and right after it ended which would be April 4, 5, & 6. Is there any chance I can be pregnant ?

    • By Midwife @Tommys on 9 Apr 2018 - 15:48

      Hi
      It is unusual to get pregnant during your period but it is not unheard of as the sperm can remain alive for several days. Have you done a pregnancy test?

    • By Regi (not verified) on 5 Apr 2018 - 11:40

      My last mense were on dec 2017,Jan and feb i didnt receive,so i took the 21 days pills so that my periods can come back,they come on day 28 (19th march and ended on 23)then I baby danced on cycle day 13,14,15,16,could I be pregnant? I really want to conceive

    • By Midwife @Tommys on 6 Apr 2018 - 12:37

      Hi Regi,
      If you are having regular sexual intercourse without contraception then you could be pregnant however you would need to take a pregnancy test. It would be a little early to take the test, and you may get a false negative result. It would best to wait until your next period would be due, then if you are late to take a pregnancy test then. In the meantime, if you are trying to conceive then we would advise for you to be taking a folic acid supplement.
      Best wishes, Tommy's midwives

    • By Tessy (not verified) on 4 Apr 2018 - 17:53

      I started my period on the 26th of March and had unprotected sex with my husband on the 27th of March my period stopped the next day.. Does that mean I will be pregnant?

    • By Midwife @Tommys on 5 Apr 2018 - 10:33

      Thank you for your comment. It is possible to become pregnant while having your period, however it is unlikely that because your period stopped the next day means that you are pregnant as it takes a few days for pregnancy hormones to develop.
      You may want to wait to see if your next period is normal before doing a pregnancy test; alternatively there are tests you can do that show if you are pregnant even before you have missed a period.

      Take care
      Tommy's Midwife

    • By Asia (not verified) on 3 Apr 2018 - 17:38

      Hello, I got off birth control 12.20.17. I have a 30 day cycle my lmp 3/18/18 & lasted for 6 days I had sex 3/25,3/27,3/29 & 4/1. I felt pain in my left side on 3/31 which I think was ovulation (not sure). I'm just confused and frustrated have been trying since ending bc really hoping I conceived this time. I guess my question is based on the days I had sex is it possible for me to still conceive after bc & the pain I felt was that ovulation & did the sperm have time to make it to the egg since last session was 4/1?

    • By Curious (not verified) on 31 Mar 2018 - 22:14

      I had gone without sex for nine months then I ended up getting my cycle on March 12 for 3 days.i have since March 15th have been sexually active almost every day what are the chances I am pregnant I'm asking cause I'm kind of having a feeling like I am cause I been really tired and having alot of same symptoms I had with my daughter

    • By Midwife @Tommys on 5 Apr 2018 - 09:46

      Hi,
      If you have been having regular sexual intercourse without any contraception then there would be a chance that you could be pregnant, if your period does not come when due then you can do a pregnancy test to see if you are pregnant. In the meantime if you are trying for a pregnancy or having sexual intercourse without contraception then we would advise for you to be taking a folic acid supplement.
      Best wishes, Tommy's midwives

    • By Sola (not verified) on 26 Mar 2018 - 18:28

      had sex 15th of March 6 to 5 days after ovulation n my period is due sinx Saturday 24th of march and I'm yet to see it

    • By Midwife @Tommys on 27 Mar 2018 - 11:52

      Hi,
      Thank you for getting in touch with us at Tommy's.
      Ovulation tends to occur around the middle of your menstrual cycle – usually about 2 weeks after the first day of your cycle, but this can vary depending on how regular and long your cycle is.
      It is usual for a woman to ovulate around 10 -16 days before their next period is due, the time of this depends on the length of her cycle, so in a 28 day cycle she would usually ovulate around Day 14. Sperm can live up to 5 days, so you can conceive 12-24 hours post ovulation. Some women also ovulate twice in their cycle. If your period is late it would be a good idea to do a pregnancy test.
      Warmest wishes
      Anna-Tommy's Midwife

    • By JAMM (not verified) on 20 Mar 2018 - 02:46

      Hi! I had my last period on Feb 22 and ended on feb 25. I had unprotected sex on March 12. My period is regular but lately I was feeling nausea. I vomit after my meal for 3days long. I also don't like some smell like the smell of fish w/c is not normal for me. I also crave for something. Last March 18 I felt my back and legs cramping. Is it a sign that I am pregnant?

    • By Midwife @Tommys on 21 Mar 2018 - 11:47

      Hi, there is a possibility you could be pregnant however the only way to know for sure is to take a pregnancy test, I would suggest to do this if your period does not come when due as doing a test prior to this make result in a false negative.
      Best wishes, Tommy's midwife.

    • By Anonymous (not verified) on 10 Mar 2018 - 22:18

      Hi,I had unprotected sex on my ovulation days then took contraceptive pills a week after that.now I have missed my periods for 3days now.
      Is it possible I am pregnant?please help

    • By Midwife @Tommys on 12 Mar 2018 - 12:08

      Hi, Best thing to do is to take a pregnancy test. If it is positive see your GP as soon as you can to discuss your options.

    • By My name is sund... (not verified) on 7 Mar 2018 - 17:59

      My period was 25feb 2018 stop28 i have sex with my husband on 28;1;2;3;4 nd 6 will i be pregnant?because i nd my husband need a child nd if my husband sperm inters inside my body it melt wat causes it pls?

    • By Midwife @Tommys on 8 Mar 2018 - 11:57

      Hi, Thank you for your comment.

      If you have been having unprotected sex then there is every chance that you may fall pregnant. You need to wait and see if you miss your next period. If you do then the next step would be to do a pregnancy test to confirm if you are pregnant. I cannot tell you if you are pregnant at this time as it is too early but missing your period would be the first indication to do a test. Hope this helps, Take Care, Tommy's Midwives x

    • By Baby andre (not verified) on 1 Apr 2018 - 17:52

      My period came on January 28and end the 3 of February and I have not got a period as yet and am wondering if it's because of my still birth last year November why this is happening .but no signs of pregnant systom

    • By Midwife @Tommys on 5 Apr 2018 - 12:41

      Thank you for your comment. I am sorry to hear about your loss and hope you are getting support with your recovery from this.
      I would suggest doing a pregnancy test even though you do not have any signs of pregnancy. Periods can be irregular when they start again after a pregnancy but it would be sensible to do a test if you think you could be pregnant again.

      Take care
      Tommy's Midwife

    • By Tracey (not verified) on 5 Mar 2018 - 14:09

      I had my period on feb 26 to march the 3rd they are usual 7 days long (the month of feb only goes to the 28). I dont know why it only lasted 6days. My periods aint regular ...i had sex on march 3 and 4 unprotected with my boyfriend could i be pregnant? Ive also got 4kids already .and yes we want to have another baby .

    • By Midwife @Tommys on 5 Mar 2018 - 16:05

      Hi Tracey,
      If you are having unprotect sex then there is always a chance that you could be pregnant, therefore if your next period is late then I would advise for you to do a pregnancy test. If you are trying to conceive then I would advise that you are taking a folic acid supplement if you are not already. Good luck!

    • By Tori (not verified) on 4 Mar 2018 - 23:36

      Hi my period usually comes around every 24 days, I ovulated (according to Flo app) on 14th had sex 2 days before and 1 day after, have taken test so many times all negative, but 4 days late, I'm confused as to when I can test? I got told that if I am I would be 4 weeks 3 days from date of last period, but fetal size is actually only 2 weeks 3 days,.. Have got milk in my breasts, a little tender, felt a bit sick, sore lower back, but no Pms symptoms I usually get like a week before period is due.. last child was 6 years ago, only taking folic acid, no contraception..

    • By Midwife @Tommys on 5 Mar 2018 - 16:08

      Hi Tori, it could be that it is just a little early and your hormone level is not yet high enough to show a positive test. I would advise to wait at least 2-3 days and repeat the test. It is great that you are taking folic acid and that you are having pregnancy symptoms, this is showing a good chance that you are pregnant. Best wishes, Tommy's midwives.

    • By Shan (not verified) on 2 Mar 2018 - 00:53

      My last period was on Jan 27 I started taking Errin bc on feb 1 and I’ve finished the pack on the 28th I haven’t gotten my period yet and me and my husband want a baby born in December my periods a irregular and I didn’t start the new pack I’m worried that I will get my period late and will unable to have a baby due in December what other options do I have since I’ve missed my ovulation dates?

    • By Midwife @Tommys on 2 Mar 2018 - 12:49

      Hi Shan,
      It is often very difficult to plan a pregnancy so precisely. As you state you usual have irregular periods so this is quite usual for you, if you want to prevent a pregnancy then continue to take your contraception as prescribed. If you are wanting to conceive then stop taking the contraception however with irregular periods and coming off contraception, your periods are not predictable and neither is when you are ovulating. If you are planning a pregnancy then it is important that you are taking a folic acid supplement. Best wishes, Tommy's midwives

    • By TANIA (not verified) on 1 Mar 2018 - 22:34

      I HAD MY LMP ON JAN 29, HAD SEX WITH MY HUSBAND ON FEB 9TH & FEB 23 CAN I STILL BE PREGNANT?

    • By Midwife @Tommys on 2 Mar 2018 - 12:17

      Hi Tania,
      If you are having unprotected sex and not had a period when due then there is a high chance that you could be pregnant. You will need to take pregnancy test to be sure however. If you are trying for a pregnancy then do make sure that you are taking a folic acid supplement.
      Best wishes, Tommy's midwives

    • By AB (not verified) on 1 Mar 2018 - 15:55

      Hi , my last period was on the 29 January.. had sex with my boyfriend on the 4th,6th and 9th February... ...
      Took a scan and had a thick endometrium on the 17th February..

      Please help my period is late

    • By Midwife @Tommys on 1 Mar 2018 - 16:01

      Hi,
      If you have been having unprotected sex and late on your period then there is a high chance you could be pregnant, however you will need to take a pregnancy test to give you a definite answer. If you are pregnant then it is important to start taking folic acid supplement straight away.
      Best wishes, Tommy's midwives x

    • By Lissa (not verified) on 28 Feb 2018 - 15:38

      I had unprotected sex during my period my period started on the 7th of February I had sex on the 11th of February i ovulated on the 17th of February and had unprotected sex again on the 20th February what are the chances of having a child

    • By Midwife @Tommys on 1 Mar 2018 - 14:09

      Hi, Thank you for your comment.

      If you have unprotected sex in your cycle then there is every chance that you could fall pregnant. We would advice that you wait to see if you miss your next period and then do a pregnancy test if you miss that period. Take Care, Tommy's Midwives x

    • By Irene Rivera As... (not verified) on 26 Feb 2018 - 22:00

      Hi, my cycle is 27days. I had my period last February 12-16, 2018. I and my Husband had sex after my period and on the first day of my Ovulation (23rdJan), we had unprotected sex again. 25th Jan, i started cramping on my left lower abdomen and had a very slippery and clear discharge and sore boobs. My due is on 10th March. Is there a tendency that i might be pregnant? Thanks for the response.

    • By Midwife @Tommys on 28 Feb 2018 - 10:00

      Hi Irene
      It is very difficult to know for sure at the moment as it would be so early. If you are pregnant, you would only be 1-2 weeks pregnant going by your last menstrual period dates. It would be best if you waited about week or so, and did a pregnancy test to be sure. Try to use the first urine of the morning when doing the test as the pregnancy hormone hcg is at its highest then for the best chance of a accurate test result.
      Good luck
      Sophie,Tommy's Midwife

    • By Anonymous (not verified) on 25 Feb 2018 - 18:40

      I had intercourse on the 14th day of my cycle (2-19th) and I'm typically on a 25 day cycle phase. I began spotting light pink about 4 days after intercourse ( 2-23) which is 8 days before my period is due. I only saw it when i wiped and it was off an on two days
      I took a early response test today and it was negative. I'm now 6 days before my period is due. Is it likely that I'm in the clear. I'm confused as to implantation bleeding happening so soon after sex. I do believe i was ovulating at the time of sex. Should i test again later?

    • By Midwife @Tommys on 26 Feb 2018 - 12:08

      Hi, There can be many reasons for spotting and it would be best for you to take a pregnancy test when your period is due. Remember that even if you have intercourse when you ovulate, there is no guarantee of a pregnancy.

    • By Ava (not verified) on 18 Feb 2018 - 08:15

      Hi there , me and my husband have been trying to conceive for a while now. I have purchased clear blue opk's and we bd (baby danced) within my fertile week 2 days before my fertile week again 2 days before the smile face stayed on the opk and the day of that smiley twice. I'm we still haven't had any joy :( this will be our first child. Am I doing anything wrong ?

    • By Midwife @Tommys on 19 Feb 2018 - 14:53

      Hi there, No you are not doing anything wrong, Sometimes it can take up to a year to conceive. Try to make sure that you and your partner are a healthy weight, not drinking or smoking, eating a healthy diet and exercising well. This way you will give yourself the best chance. Our pages give you lots of advice to follow and keep as healthy as possible. Be patient and take care x

    • By Ngozi (not verified) on 13 Feb 2018 - 21:08

      My first period was on 28 January it lasted for 5days ,it stop on ist February,and all this why I have be meeting my husband please is there any Chance of getting pregnancy.

    • By Midwife @Tommys on 14 Feb 2018 - 11:15

      Hi Ngozi
      If you had unprotected sex with your husband and your last period was on 28th jan, then the most pregnant you could be is 2-3 weeks pregnant. I would recommend that you wait another week and then do a pregnancy test when you might be approx 4 weeks pregnant. If you have a negative test, then it might be sensible to go to your GP for review and referral to a Gynaecologist.
      All the best
      Sophie,Tommy's Midwife

    • By Anusha (not verified) on 13 Feb 2018 - 19:58

      My last period was 19 December 2017.... I got relation with my husband 15 January..... I didn’t get my mence yet... you think I’m pregnant????

    • By Midwife @Tommys on 14 Feb 2018 - 11:12

      Hi Anusha
      Using your last menstrual period date of 19 Dec 2017, the most pregnant you could be is 7-8 weeks. It might be sensible to do a pregnancy test if you have not already done one and have not seen your period. If it is negative, then i suggest that you go to your GP to be reviewed and perhaps be referred to a Gynecologist.
      All the best
      Sophie,Tommy's Midwife

    • By Dll (not verified) on 4 Feb 2018 - 05:40

      I had sex with my boyfriend 2 days after my last day of period and he withdraw. My interval usually takes 30 days. Is there chance to get pregnant?

    • By Midwife @Tommys on 5 Feb 2018 - 15:21

      Yes, There is no 'Completely safe time' as sperm can live for up to 7 days. If you think that you may be pregnant you can do a pregnancy test when your next period is due.

    • By Jess (not verified) on 29 Jan 2018 - 02:29

      Could I get pregnant if I'm on the pill and he pulled out? I haven't have my my period since September with the way my pills are?? Help?

    • By Midwife @Tommys on 29 Jan 2018 - 16:39

      Yes, most forms of contraception have a risk of failure. If you think that you may be pregnant. take a pregnancy test just to be sure.

    • By asana (not verified) on 25 Jan 2018 - 22:41

      had unprotected sex with the withdrawal method on my fertile day four and then took birth control injection later drink postinor 2 will i still get pregnant

    • By Midwife @Tommys on 26 Jan 2018 - 11:26

      Hi Asana,
      It is unclear from your message how long it was after intercourse you had the birth control injection and what type of injection this was. If it was a few days later then it may not have prevented a potential pregnancy. I would advise that if your period does not come when expected then to take a pregnancy test to be sure. Taking a test before this time may result in a false negative result. Take care, Tommy's midwives.

    • By Michelle (not verified) on 25 Jan 2018 - 21:18

      Hello my bf cummed in me 11 days before my period. My last period was on january 5. Do i have the chance of getting pregnant?

    • By Midwife @Tommys on 26 Jan 2018 - 11:15

      Hi Michelle,
      Yes there is a chance that you could be pregnant. Having intercourse without contraception means there will always be a chance of pregnancy. If your period does not come when due then it would be important to take a pregnancy test to see if you are pregnant. Taking a test before this time may result in a false negative. Take care, Tommy's midwives.

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