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4 weeks pregnant

Find out about what happens when you are 4 weeks pregnant. You are likely to notice signs and symptoms at this stage and it will have been 4 weeks since your last period.

Week-by-week stages of pregnancy: week 4

By week four of pregnancy the blastocyst is now properly embedded into the uterus lining. The blastocyst will divide, some of it will become the placenta and some will become the embryo. The beginnings of the umbilical cord will start to form too.

It has been four weeks since your last period and it would usually be time for your next one. As the chemical signals have been sent to prevent ovulation and your body starts to release human chorionic gonadotrophin (hcg) you will miss your period. This is the first time you will notice you are pregnant. You can do a pregnancy test as soon as your period becomes overdue. These are available from supermarkets and pharmacists, and work by checking your urine for the pregnancy hormone.

You are now 4 weeks pregnant. You can find out how your due date is calculated here.

When you are 4 weeks pregnant, symptoms typically become more pronounded and can include:

  • Feeling heavy in lower abdomen
  • Mild, period-like cramps which come and go
  • An acute sense of smell
  • A metallic taste in your mouth
  • You may find you suddenly go off things or developing cravings for others. Often coffee becomes disliked
  • Feeling very tired
  • Sickness
  • Needing the toilet more often.

Over weeks 4-5 of pregnancy, great developments will happen in your womb as your embryo begins to develop. Find out more about your embryo’s journey in week five of pregnancy.

Further help and information

NCT's helpline offers practical and emotional support in all areas of pregnancy, birth and early parenthood: 0300 330 0700. We also offer antenatal courses which are a great way to find out more about birth, labour and life with a new baby.

Join in with NCT on Facebook and Twitter - it's a great way to make new friends and stay in touch with old ones. Or joint our community for new parents on Google+ where you can connect with other parents online who are experiencing similar things.