I had something similar. I went to a chiropracter after seeing my midwife. They both agreed that my hips were out of alignment and it was pinching on a vein, which made blood stagnate in my vagina (within my body, not coming out of my vagina). Because the blood was not able to flow properly through my genitals I would have extreme cramping in my vagina, especially after intercourse. My chiropracter adjusted me and within a week the pain went away.
It could also be the pressure from the weight of the baby pressing down.
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