Vagina pain

I’m 20 weeks pregnant and have been having lots of round ligament pain on my sides—very normal, not a problem. Well last night after my DH and I had sex, I rolled over and all of the sudden has EXTREME pain in my vagina. I literally felt like it was being torn open. After about 2 minutes it went away and hasn’t been a problem since. Could this have been round ligament pain, just feeling it in a different area? I’ve always felt RLP on my sides and abdomen—definitely not right in my vagina. Any ideas?