Week 1
It will be around two weeks before your partner's sperm fertilizes your egg and creates your baby, but the age of your unborn baby is calculated from the start of your last menstrual period.
Next: Fetal Development Week by Week Fetal Development - Week 2
Content provided on this site is for educational purposes only and should not be construed to be medical advice, diagnosis or treatment.
Click here for additional information.
follow us on twitter!
What is your biggest pregnancy fear?