Vaginal pain at 30wks+

I'm am 30wks n 5 days...since the middle of the night I've been having vaginal pain. It feels like my vagina is swollen beyond belief but when my SO looked at it it looks fine.idk wats wrong wit it . I don't feel like pressure or anything down there...is anyone else experiencing this or know whether or not if this is a normal feeling...this is my third child but I don't remember experiencing this with my other 2