Preterm labor or braxton hicks?

Clairexoxo

I’m currently 33 weeks and the last two days I’ve been having mild period like cramping off and on all day. I’ve also been having hardening of the stomach and I thought it was just my baby pushing his butt out, but now I’m thinking maybe it was braxton hicks. My stomach isn’t hardening all over, mainly just across the top. I’ve also felt nauseous a few times over the past few days. Is this normal or should I call my doctor?