Pregnancy is calculated from the first day of your last normal period, even though fetal development does not begin until conception. This is because each time a woman has a period, her body is preparing for pregnancy. A pregnancy month is always exactly 4 weeks. For example, if you’re 32 weeks pregnant, you would say you’re 8 months pregnant even if some of the calendar months were closer to 5 weeks long.A pregnancy calculator can provide an estimated pregnancy schedule based on the due date, last period date, ultrasound date, conception date, or IVF transfer date. Gestational age measures how far along a pregnancy is in weeks, while fetal age is the actual age of the growing baby.
