Sorry for the tmi...
I'm 20 weeks pregnant and when I sit down to go to the loo I get a pain in my vagina, very close to the entrance, kind of in the muscles that make up the walls. It is identical to the pain you get when you are young and have been having lots of sex. It's not there generally, only when I sit on the loo, and sex is not painful.
Would this be weak pelvic floor, or something else?