Pregnancy: The state of carrying a developing embryo or fetus within the female body. This condition can be indicated by positive results on an over-the-counter urine test, and confirmed through a blood test, ultrasound, detection of fetal heartbeat, or an X-ray. Pregnancy lasts for about nine months, measured from the date of the woman’s last menstrual period (LMP). It is conventionally divided into three trimesters, each roughly three months long.The most important tasks of basic fetal cell differentiation occur during the first trimester, so any harm done to the fetus during this period is most likely to result in miscarriage or serious disability. There is little to no chance that a first-trimester fetus can survive outside the womb, even with the best hospital care. Its systems are simply too undeveloped. This stage truly ends with the phenomenon of quickening: the mother’s first perception of fetal movement.

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