Period cramps, & constant back pain? PLEASE HELP.

I am 38 weeks, since 4 am I've been having constant back pain & period like cramps, also some "stabbing" in my vagina. I know this is an app, & no one is really a professional, but every time I call the Dr they tell me "it's normal" & that I am probably creating/imagining these pains. Has anybody else felt this, or have an IDEA of what it can be? Please help..