When should I go to the hospital?

Alyssa • Mommy to an angel💜👼 and my rainbow Alyvia Louise🌈💖

I’m having absolutely horrible pain very low it started around 11 I’m 37 weeks pregnant I have a doctors appointment in the morning should I just wait and bring it up then? I can kind of breathe through it but when I laid down I started crying because it made it so much worse how long should I let it go on before I go to the hospital?