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I hope this article helps I found on answers.com The period during which a developing fetus is carried within the uterus. In humans, pregnancy averages 266 days (38 weeks) from conception to childbirth. Traditionally, pregnancy duration is counted from the woman's last menstrual period, which adds roughly 2 weeks to gestational age. This is how physicians arrive at a pregnancy length of 40 weeks (280 days). The 9 months of pregnancy are typically divided into three periods (trimesters) of 3 months. The first sign of pregnancy is often the absence of an expected menstrual period. Common symptoms include nausea, breast tenderness, fatigue, and frequent urination. The diagnosis of pregnancy can be made as early as 10 days after fertilization by means of blood tests. By 6 weeks (from the last menstrual period), the uterus feels soft and is palpably enlarged. Pregnancy can be positively confirmed by observing cardiac motion of the fetus by ultrasound scanning (8 weeks) or by hearing fetal heart

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