Inside Story

First trimester

1 WEEK

Not really pregnant – your dates are taken from the start of your last period so this week it’s likely you’ll be menstruating, but everything’s in place for conception.

2 WEEKS

Your eggs were made while you were in the womb, but your partner’s sperm is produced continuously from puberty.

3 WEEKS

Congratulations – you’ve made a… blastocyst; a ball of cells that will form an embryo. Your baby is smaller than the full stop at the end of this sentence.

4 WEEKS

You baby becomes an embryo, with half the blastocyst breaking off to form the placenta and the other half making your baby, including a primitive heart.

5 WEEKS

Your baby continues to develop. Her neural tube – essentially her brain and spine – goes through a growth spurt this week, so make