Braxton hicks?

Ever since 30 weeks (I'm 34 now) I get really bad period cramps. They usually happen more in the evening and at night sometimes they feel like I'm about to start my period (like that really uncomfortable feeling in your cervix) they last 1-2 minutes sometimes longer. I've talked to my doctor about it and she said it could be the way I'm feeling Braxton hicks.

Has anyone else had them feel this way? What did you do to stop the pain? I drink a gallon of water a day, so hydration isn't the issue. I normally would take a warm bath with this, can I still take baths?? Did you take baths towards the end of your pregancy?