37+3 and crampy?

Brittaney • I have an amazing 6 year old who is my world. And an amazing husband who i thought id never find after my first who treated me like crap for 12 years!
What does it mean? Is this the start of contractions? It isn't a start and stop its just a continuous type feeling like I'm about to start my period? I never had this feeling with my first 8 years ago. A lot of this are different this pregnancy. I think I've lost my MP. I go to the dr tomorrow so I was trying to hold off on going into L&D if this was normal?