Human pregnancy


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Note: Pregnancy is the time during which one or more offspring develops (gestates) inside a woman´s uterus (womb).[13] A multiple pregnancy involves more than one offspring, such as with twins.[14]

Pregnancy usually occurs by sexual intercourse, but can also occur through assisted reproductive technology procedures. A pregnancy may end in a live birth, a miscarriage, an induced abortion, or a stillbirth. Childbirth typically occurs around 40 weeks from the start of the last menstrual period (LMP), a span known as the gestational age. This is just over nine months. Counting by fertilization age, the length is about 38 weeks.[13] Pregnancy is "the presence of an implanted human embryo or fetus in the uterus"; implantation occurs on average 8–9 days after fertilization.[15] An embryo is the term for the developing offspring during the first seven weeks following implantation (i.e. ten weeks´ gestational age), after which the term fetus is used until birth.