Reviewed April 2014, next review April 2017

illustration of fetus with heading: Pregnancy calendar

Your pregnancy calendar

Feeling forgetful?


Write a list of questions or concerns that you have and take it with you to your booking appointment.

Finding out that you are pregnant, whether you have been trying for a pregnancy or not, can come as quite a surprise - or even a shock!

It may seem hard to take in at first, and you might find the stories you hear from family, friends or the media rather overwhelming. Don't worry - we're here to help. There's lots of information on this website about you and your baby and what will happen in the coming months.

A little support and reassurance can go a long way towards helping you and your partner enjoy your pregnancy and bond with the baby growing inside you.

Read about the care you will be offered in your pregnancy here.

So what is a trimester?

People often talk about pregnancy as being nine months long. In fact it’s usually slightly longer than this. Your pregnancy is measured from the first day of your last period rather than the day you actually conceived.

A pregnancy generally lasts around 40 weeks, and your dates are referred to in weeks because this is more accurate than talking in months.

Your pregnancy has three phases, called trimesters, and each trimester is about three months long.

Each trimester has its own mix of highs and lows, and you can find out what to expect in this pregnancy calendar. The information in the calendar may be helpful for the people close to you as well.

The first trimester (one to 12 weeks)

A lot happens during these first 12 weeks. The fertilised egg divides into layers of cells to become an embryo, which is what the baby is called at this stage. These cell layers will quickly grow into a tiny baby, which is called a fetus.

The second trimester (13 to 28 weeks)

In the middle three months of your pregnancy you may really start to look and feel pregnant. You may also have more energy than you did in the first trimester. This will come as a great relief if you have been struggling with sickness and tiredness.

You'll gradually see your bump starting to show and in the middle to later part (18-20 weeks) of this trimester you'll begin to feel your baby moving.

This trimester is a time of fast growth for your baby.

The third trimester (29 to 40 weeks)

Your baby will continue to grow during this trimester. From now on he or she will have a better chance of survival if you go into labour early.

The position your baby is in becomes more important as the time for birth gets closer, and you'll start to think about what happens during labour and making a birth plan.

This is a time to prepare for the birth and enjoy some time to yourself while you get ready to finally meet your baby.

A healthy pregnancy

As well as this calendar, the Tommy's site is packed with information on all aspects of pregnancy health and well being, helping you to look after yourself and your baby. You'll find more help on pregnancy- related topics below, including:


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On this page


So what is a trimester?

A healthy pregnancy

Pregnancy calender



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