Braxton Hicks

I’ll be 29 weeks on Monday. All evening I can feel that the baby is really low and I constantly feel like I have to pee. When my husband and son went to bed, I started getting cramps that feel like period cramps. The top of my stomach is hard as a rock. Baby has been moving around just fine. Is it normal to have Braxton Hicks this early or should I call the doctor in the morning and talk to whoever is on call? This is my second and I was told Braxton Hicks were more of a feeling that would start in my back and wrap around to my belly and I didn’t notice it until I was at least 36 weeks or so. Baby is moving like crazy and it’s making the pelvic cramping feel worse. Is this normal?