First time mom, labor coming soon?

Tiffany

38.5 weeks today. This pst Friday I was 1 centimeter. Sunday I had a few period like cramps but they went away after laying down. Nothing really happened yesterday. But today I started feeling a sharp pain going up my spine, a lot of pressure on my pelvis, and more period type cramps. And quite a few Braxton Hicks. Not sure if I’m supposed to time this stuff or? I have an appointment tomorrow afternoon so. Just so confused and uncomfortable!