Human fartilization

Pregnancy . Pregnancy Classification and external resources A pregnant woman. ICD - 10 Z 33 ICD - 9 650 DiseasesDB 10545 MedlinePlus 002398 eMedicine article/259724 MeSH D011247 Pregnancy is the fertilization and development of one or more offspring, known as an embryo or fetus , in a woman's uterus . In a pregnancy, there can be multiple gestations , as in the case of twins or triplets . Childbirth usually occurs about 38 weeks after conception; in women who have a menstrual cycle length of four weeks, this is approximately 40 weeks from the start of the last normal menstrual period (LNMP). Human pregnancy is the most studied of all mammalian pregnancies . Conception can be achieved through sexual intercourse or assisted reproductive technology . An embryo is the developing offspring during the first 8 weeks following conception, and subsequently the term fetus is used henceforth until birth. 40% ofpregnancies in the United States and United Kingdom are unplanned , and between a quarter and half of those unplanned pregnancies were unwanted pregnancies . Of those unintended pregnancies that occurred in the US, 60% of the women used birth control to some extent during the month pregnancy occurred. In many societies’ medical or legal definitions, human pregnancy is somewhat arbitrarily divided into three trimester periods, as a means to simplify reference to the different stages of prenatal development . The first trimester carries the highest riskof miscarriage (natural death of embryo or fetus). During the second trimester, the development of the fetus can be more easily monitored and diagnosed. The beginning of the third trimester often approximates the point of viability , or the ability ofthe fetus to survive, with or without medical help, outside of the uterus .