pregnancy stages and symptoms?

Stages of pregnancy

Pregnancy lasts about 40 weeks, counting from the first day of your last normal period. The weeks are grouped into three trimesters. Find out what's happening with you and your baby in these three stages.
First trimester (week 1–week 12)
Second trimester (week 13–week 28)
Third trimester (week 29–week 40)
Your developing baby