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Gestational age is contrasted with fertilization age, which takes the date of fertilization as the start date of gestation. There are different approaches to defining the start of a pregnancy . This definition is unusual in that it describes women as becoming "pregnant" about two weeks before they even had sex.
This is part of the reason why counting your pregnancy weeks can be confusing. How long does implantation last? Although most pregnancies are 40 weeks , the process of implantation represents only ...
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. [4] [5] This is just over nine months. Counting by fertilization age, the length is about 38 weeks.
(from the start of the last menstrual period) Fertilization age Implantation age Menstrual period begins Day 1 of pregnancy Not pregnant: Not pregnant: Has sex and ovulates: 2 weeks pregnant Not pregnant: Not pregnant: Fertilization; cleavage stage begins [3] Day 15 [3] Day 1 [3] [4] Not pregnant: Implantation of blastocyst begins Day 20 Day 6 ...
[13] [14] The result is approximately 280 days (40 weeks) from the start of the last menstrual period. Another method is by adding 9 months and 7 days to the first day of the last menstrual period. Another method is by adding 9 months and 7 days to the first day of the last menstrual period.
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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 ]
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