It's also a very common female experience.
Doctors describe a woman's progress through pregnancy in terms of weeks.
A full-term pregnancy is said to be 40 weeks long. This is calculated from the date of the first day of a woman's last period, although conception does not take place until approximately two weeks later. So much is going on during pregnancy that a single week can mean an enormous change in the development of the child you carry within you. The first trimester includes the first 13 weeks of pregnancy. During this trimester your baby will grow from a fertilized egg to a fetus with all the fetal organs functioning.