Anyone In Their 3rd trimester feeling super crampy?

I'll be 29 weeks Monday. Yesterday and today I have noticed more and more crampiness in my uterus! Like menstral cramp feeling. I'm assuming that's Braxton hicks. It's so uncomfortable. Any suggestions? Today I was off and tried sleeping in but the crampiness woke me up. I'm trying to stay super hydrated and empty my bladder more often. Would it be bad to do a light workout today? I'm starting to get nervous bc I plan on working up until my due date and I'm scared these may be warning signs. I know I'm supposed to count how many I have an in an hour but it's hard bc I don't know what are just cramps and what are Braxton hicks! This is my first child