Cramping at 34 weeks

Anyone have experience with menstrual-like cramping at 34 weeks? Idk if I should call the dr about it or not. I know it's not BH because I've had those since week 20 and I know for sure what those feel like. I haven't lost any fluids or plug and I don't have an appointment again until the May 2.  I drink LOTS of water, so it's not dehydration and I have had an ectopic pregnancy before this one.  This is the second night it's kept me up and it's more noticeable at night than during the day. Anyone?