31 weeks Saturday;Question!

Brittanie • Ariel Diana Nichole was born 9/7/16😊 Pregnant with my 2nd 💕
I will be 31 weeks on Saturday. I've had BH contractions since 18 weeks. So I'm used to that, but since 29w6d (or so), I've been experiencing period-like cramps in the right side of my lower abdomen, close to my hip bone. Sometimes it'll make my back ache. Yesterday, I had a few BH contractions that started off in my lower abdomen like always, then they slowly went up above my belly button. It wasn't too painful, but I've never felt that before. I wanted to see if you ladies knew what this was, or what it sounds like before I call my ob because she is always so busy. Any advice would be great! Thank you! -FTM 😊