I think it's a bit more involved than that. The entire musculature of the uterus contracts when a woman has menstrual cramps. The cervix itself really has no muscles, if I remember correctly, it's just very dense tissue. And I'm pretty sure the birthing process is a whole different set of muscles and contractions. Regardless, GPR will very likely help.
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The scientist has a question to find an answer for. The pseudo-scientist has an answer to find a question for. ~ "Failure is the path of least persistence." - Chinese Fortune Cookie ~ Logic left. Emotion right. But thinking, straight ahead. ~ Sperate supra omnia in valorem. (The value of trust is above all else.) ~ Meowsomeness!