When I was pregnant, I had vaginal pains fairly often. There are a couple of nerves that run along the uterus that can cause phantom pains when the baby sits just right. I also had feelings like there was something in my birth canal, and at times I could have sworn that there was a foot or an arm sticking out. They pretty much stopped for me by 36 weeks, but I also had a huge baby (9lbs 3oz) that had beyond run out of room at that point. Mention it to your doctor at your next visit, and she'll probably say its no big deal.