Is this normal or what could it mean??

I am almost 37 weeks pregnant and my vagina has been hurting randomly but goes away quick. Almost every time I bend it hurts and I don't even bend a lot it's like the slightest things, the other day I leaned over the bed to grab my charger and it began to hurt so bad but once I leaned back up within 15-30 seconds it goes away. I finally have my doctors appointment tomorrow to ask my doctor about it but it just happened again and I'm really curious to know what it may be or if it's normal or not ??