Vaginal Muscle Pain?!

I am 34 weeks and 2 days with my second child. I have gestational diabetes but have been diet controlled only since 30 weeks when I found out. Baby is measuring perfectly, haven’t had any extra ultrasounds since 22 week anatomy scan and no other complications. I have noticed when I sit to pee, or like “push” my vagina like I am peeing it hurts pretty bad. I’ve noticed it when I get up from sitting or today I was coloring with my toddler and was on hands and knees and it hurt. It’s not a sharp pain and feels like my muscles are hurting. I described it to my fiancé like when you workout for so long and then the next day your muscles ache. That’s kind of how it feels, any ideas on what this could be?