Pregnancy

Pregnancy, also known as gestation, is the time during which one or more offspring develops inside a woman. A mutiple pregnancy involves more than one offspring, such as with twins. Pregnancy can occur by sexual intercourse or assisted reproductive technology. Childbirth typically occurs around 40 weeks from the start of the last menstrual period. This is just over nine months, where each month averges 31 days. When mesured from fertilzation it is about 38 weeks. An embryo is developing offspring during the first eight weeks following fertilzation, after which, the term fetus is used until birth. Symptoms of early pregnancy may include missed periods, tender breasts, nausea and vomiting, hurger, and frequent urination. Pregnancy may be comfirmed with a pregnancy test.