Stages of a normal pregnancy include:

• Ovulation
• Fertilization
• Implantation
• Growth
• Delivery

Doctors divide a normal pregnancy into three equal divisions called trimesters. The first trimester of pregnancy extends from conception to 12 weeks after the last period, or slightly less than 3 months. The second trimester of pregnancy extends from the 13th week until the 27th week. The third trimester of pregnancy extends from 28 weeks after the last normal period to birth.