The ultimate HerFamily guide to your pregnancy: Week 4 7 years ago

The ultimate HerFamily guide to your pregnancy: Week 4

Week 4 – Congratulations! You're in the 1st trimester! Read more about trimesters here.

This week....

Your baby

Is the size of a poppy seed, just a little bigger than this full stop. The fertilised egg (or eggs) — known as a zygote — has arrived in your womb and implanted into its wall. It has divided into two; one group of cells will become the embryo, the other its life support mechanism, the placenta.

The placental cells immediately begin to produce Human Chorionic Gonadotrophin, the hormone that a pregnancy test looks for before it shows you those life-changing blue lines.


Early pregnancy symptoms including sore boobs, feeling bloated, and moodiness. If you’re not expecting to be pregnant you can easily mistake them for PMS - particularly if you experience implantation bleeding and mild cramping.


Your heart rate is already increasing. Notice a strange taste in your mouth? It’s another early sign.

Tip: It's still early days in the life of your little poppy seed and while it may not feel like much is happening yet, there's a lot going on behind the scenes.


Reading up on all the weird and wonderful things that are happening to you is a lovely way to relax in the early months of pregnancy. Check out our 'Top 10 Books To Read When Pregnant'

More: So how did you know you were pregnant??? Were there any odd signs hinting at the changes within?

'12 Women Reveal The Weird Signs That Hinted They Were Pregnant'