36+6 weeks;sharp pain in pelvic area?

Okay, so as the title says, I'm going to be 37 weeks tomorrow. I've been having a bruise-ish kind of feeling in my actual vagina for about 3-4 days now. But today, actually like 30 minutes ago, it was almost hard to walk because right at my pelvic bone area, I had a SUPER sharp pain? Didn't know if any of you ladies knew what was causing this? I'm a FTM. Haven't been told the estimated length or weight of my little girl, and I haven't been checked to see if she's head down or not. Idk when all that's supposed to be told. But MAN did that hurt.