
Typically, morning sickness begins about the same time the placenta begins serious production of human chorionic gonadotropin (HCG), a special pregnancy hormone around week six of pregnancy. In most women, symptoms peak during week eight or nine and wane after week 13.
The good news is that morning sickness seems to be a sign that the pregnancy is going well. A National Institute of Child Health and Human Development study of 9,098 pregnant women found that women were less likely to ...
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