The evidence of increased perinatal mortality and morbidity in prolonged pregnancy compared with delivery at 39 or 40 weeks' gestation inevitably leads to the conclusion that some cases of prolonged pregnancy should be prevented by earlier delivery. It would seem logical to use screening tests to identify pregnancies that are destined to have an adverse outcome and to intervene selectively in these pregnancies.
The ideal test of fetal well-being in prolonged pregnancy would allow identification of all fetuses at risk of adverse outcome, at a stage where delivery would result in a universally good outcome. Pregnancies testing 'negative' in this test would be safe in utero for an interval of a few days until either delivery or a repeat test occurred and would eventually deliver with a good outcome. At present, no method of monitoring post-term pregnancy is backed up by strong evidence of effectiveness. There is some observational evidence that some pregnancies at risk of adverse outcome can be identified, but less evidence that prediction of the adverse outcome confers prevention.
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The first trimester is very important for the mother and the baby. For most women it is common to find out about their pregnancy after they have missed their menstrual cycle. Since, not all women note their menstrual cycle and dates of intercourse, it may cause slight confusion about the exact date of conception. That is why most women find out that they are pregnant only after one month of pregnancy.