Contractions or Braxton Hicks? First time mom.

Me and my fiancé had sex last night and I couldn’t keep going I started cramping really bad. I laid down and then I kept feeling contractions they hurt enough to make me cry. I didn’t think to time it.. but it was several of them, one after the other, back to back. And I’ve had a few this morning. Is it worth calling and seeing the Dr this morning??? 37 WEEKS!