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Human pregnancy can be divided into three trimesters, each approximately three months long: the first, second, and third trimester. The first trimester is from the last menstrual period through the 13th week, the second trimester is 14th–28/29th week, and the third trimester is 29/30th–42nd week. [6]
The mean pregnancy length has been estimated to be 283.4 days of gestational age as timed from the first day of the last menstrual period and 280.6 days when retrospectively estimated by obstetric ultrasound measurement of the fetal biparietal diameter (BPD) in the second trimester. [12]
Pregnancy may be confirmed with a pregnancy test. [7] Methods of birth control—or, more accurately, contraception—are used to avoid pregnancy. Pregnancy is divided into three trimesters of approximately three months each. The first trimester includes conception, which is when the sperm fertilizes the egg.
Women who had a healthy body weight pre-pregnancy and put on more than 10 pounds (which is recommended and healthy, BTW) might work toward their pre-pregnancy weight over a 12-month period after ...
Gestational age: 3 weeks and 0 days until 3 weeks and 6 days old. 22–28 days from last menstruation. Embryonic age: Week nr 2. 1 week old. 8–14 days from fertilization. Trophoblast cells surrounding the embryonic cells proliferate and invade deeper into the uterine lining. They will eventually form the placenta and embryonic membranes. The ...
If you're experiencing the first symptoms of pregnancy or wondering when pregnancy symptoms start, you can look forward to week 13, or the start of the second trimester, when early pregnancy ...
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