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Implantation bleeding occurs between 7 and 14 days after fertilization, [57] and is a small amount of light vaginal bleeding or spotting that can occur in early pregnancy due to the blastocyst penetrating the lining of the uterus during implantation.
The female biological clock can vary greatly from woman to woman. A woman's individual level of fertility can be tested through a variety of methods. [1] In the United States, between 1997 and 1999, 539 births were reported among mothers over age 50 (four per 100,000 births), with 194 being over 55. [2]
Implantation happens at 6–7 days after conception and involves the embedding of the growing embryo into the mothers uterus and a connection being formed. [2] A successful implantation can be determined by using an ultrasound to view the sac which the baby grows in, inside the uterus. [1] However, the exact definition of RIF is debated.
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Leg cramps – Leg cramps (involuntary spasms of the calf muscles) can affect between 30% and 50% of pregnant women and most commonly occur in the last three months of pregnancy. [20] Leg cramps typically last only for a few seconds, however they can be extremely painful and last for minutes. [21]
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. [16] For optimal pregnancy chance, there are recommendations of sexual intercourse every 1 or 2 days, [ 17 ] or every 2 or 3 days. [ 18 ]
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.