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Preterm and postterm are defined above, whereas premature and postmature have historical meaning and relate more to the infant's size and state of development rather than to the stage of pregnancy.The symptoms and discomforts of pregnancy are those presentations and conditions that result from pregnancy but do not significantly interfere with activities of daily living or pose a threat to the health of the mother or baby. Sometimes a symptom that is considered a discomfort can be considered a complication when it is more severe.Similarly, the term parity is used for the number of times that a female carries a pregnancy to a viable stage.
A third point in time is also considered by some people to be the true beginning of a pregnancy: This is time of implantation, when the future fetus attaches to the lining of the uterus.
For example, nausea (morning sickness) can be a discomfort, but if, in combination with significant vomiting it causes a water-electrolyte imbalance, it is a complication known as hyperemesis gravidarum.
Common symptoms and discomforts of pregnancy include: In addition, pregnancy may result in pregnancy complication such as deep vein thrombosis or worsening of an intercurrent disease in pregnancy.
Women who have never carried a pregnancy achieving more than 20 weeks of gestation age are referred to as nulliparous.
The terms preterm and postterm have largely replaced earlier terms of premature and postmature.
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The fusion of male and female gametes usually occurs following the act of sexual intercourse.