The browser you are using is too old for our website. Please visit from Chrome and you will be able to browse normally.


      The first trimester of pregnancy

      Web Only - Aptamil pregnancy 20weeks 9

      What to expect in the early stages of pregnancy

      If you’ve just found out you’re pregnant, you may be full of questions about what happens next. Here you’ll find lots of useful information to help you get your pregnancy off to the best possible start, including advice about exercising and keeping fit and what to eat while you’re pregnant.

      If you have any questions or niggles, no matter how silly they seem, feel free to give us a call – that’s what we’re here for!

      First trimester: Your baby’s development week by week

      Amazing things are happening inside your body. Click on any week and discover how your baby’s developing, how your body’s changing as well as some fascinating facts about your pregnancy.

      Your baby's development week by week

      Click on any week to find out how your baby is changing, learn more about some of the things you might be experiencing, and discover some fascinating facts about your pregnancy.

      Calculate your pregnancy week

      What's your due date?

      Date (yyyy-mm-dd) should be within the upcoming 40 weeks
      I don't know my due date

      Calculate your due date

      What's the first day of your last menstruation cycle?

      Make sure the date you entered is within the last 9 months.

      What's the length of your menstruation cycle?

      Calculate your due date

      Your due date is

      8 april 2018

      You are in week

      I'm in another week

      You are in week

      Want to stay up-to-date week by week?

      You are already subscribed for our pregnancy newsletter

      I'm not, where can I subscribe?
      I'm in another week

      Food and drink during labour

      How long is the first trimester?

      Your first trimester lasts 12 weeks in total, and starts from the first day of your last period. This means that by the time you’ve taken a pregnancy test and had a positive result, you could already be five or six weeks pregnant.

      Diarrhoea in the first trimester

      All of the hormonal changes your body goes through during the first trimester can affect your digestive system, and unfortunately diarrhoea can be a common side effect. It’s all part and parcel of pregnancy so try not to worry. It’s a good idea to drink plenty of water if you can until the symptoms pass, because diarrhoea can leave you dehydrated. And of course, if you have any questions or concerns, speak to a pharmacist or your GP.

      Bleeding and cramps in the first trimester

      Light bleeding, spotting and cramps are very common during early pregnancy and are usually no cause for alarm. However, if you experience any heavy bleeding, or cramps that feel stronger than period pains, it’s best to give your GP a call, just to be on the safe side.

      Weight gain in the first trimester

      While some women so no sign of extra weight for months, others put on weight from the get-go. Whichever camp you fall into, try not to stress about it. The reality is that every woman puts on extra weight during pregnancy – you can thank all the extra litres of bodily fluids, the increasing size of your uterus and breasts and the small human you’re growing for that!

      Pregnancy weight gain is different for everybody – and for every pregnancy for that matter. We’ve got lots of information to help you understand a bit more about weight gain in pregnancy and what to expect.

      Flying in the first trimester

      Flying during your first trimester is totally up to you. While it’s perfectly safe to fly during the first three months (and beyond!), if you’re feeling nauseous and sick or tired and low on energy, you might prefer to give travelling a miss.

      More from pregnancy

      Your privacy is important to us and therefore we would like to explain how we use cookies on this website. With your consent, we will use cookies to measure and analyse how our website is used (analytical cookies), to tailor it to your interests (personalisation cookies), and to show you relevant advertising and information (targeting cookies) we think you will like. For more information please read the cookie statement.

      Privacy Settings

      You can choose your preferences anytime for cookies and tracking. For more information please read our cookie policy.

      • Strictly necessary

        They are necessary for the website to function and cannot be switched off. They are usually only set in response to actions made by you which amount to a request for services (setting your privacy preferences, logging in, filling in forms, etc.). You can set your browser to block or alert you about these cookies, but some parts of the site will not then work.

      • Analytical cookies

        They allow us to count visits and traffic sources, to measure and improve the performance of our site. They show us which pages are the most and least popular and how visitors move around the site. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance.

      • Personalisation cookies

        They enable website’s enhanced functionality and personalization. They may be set by us or by third parties whose services we have added to our pages. If you do not allow these cookies, some or all of these services may not function properly.

      • Targeting cookies

        They may be set through our site by our advertising partners, to build a profile of your interests and to show you relevant adverts on other sites. They do not store directly personal information, but are based on uniquely identifying your browser and internet device. If you do not allow these cookies, you will experience less targeted advertising.