ten weeks' gestational age), after which the term fetus is used until birth. An embryo is the term for the developing offspring during the first seven weeks following implantation (i.e. Pregnancy is "the presence of an implanted human embryo or fetus in the uterus" implantation occurs on average 8–9 days after fertilization. Counting by fertilization age, the length is about 38 weeks. Childbirth typically occurs around 40 weeks from the start of the last menstrual period (LMP), a span known as the gestational age. A pregnancy may end in a live birth, a miscarriage, an induced abortion, or a stillbirth. Pregnancy usually occurs by sexual intercourse, but can also occur through assisted reproductive technology procedures. A multiple pregnancy involves more than one offspring, such as with twins. Pregnancy is the time during which one or more offspring develops ( gestates) inside a woman's uterus (womb). Sexual intercourse, assisted reproductive technology īirth control (including emergency contraception) ~40 weeks from the last menstrual period (38 weeks after conception) Miscarriage, high blood pressure of pregnancy, gestational diabetes, iron-deficiency anemia, severe nausea and vomiting Missed periods, tender breasts, nausea and vomiting, hunger, frequent urination A woman in the third trimester of pregnancy
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