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Oops, didn't answer your question . . . Nobody is really sure what causes morning sickness. It's thought that it's HCG that causes a lot of the morning sickness symptoms, but they also think maybe it's as the uterus expands, the increasing blood volume and all kinds of things. Progesterone is a hormone that causes your body to continue a pregnancy. If he's putting you on it, it's probably because he thinks you doesn't produce enough on its own to sustain a pregnancy.

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