BHs are more tightenings than pains.. the further along you are or close to labour they do get painful.
Mine tighten my bump and it goes lop sided to the side Noah is laying, i get back ache at the same time. Sometimes lower cramps.
But at 33wks it was more tightening and uncomfortable then any period type pains.
But everyone is different hun, so that might be how urs are xx