contractions vs BH

So I've had maybe 4 times where My stomach feed tight and gets hard no pain or anything which I think those are BH And then I've had this happen more often where my stomach gets hard and there is a lot of pressure in my lower Abdomen/pelvic area. My question is could that still be BH or just the way the baby moved. I go to dr tomorrow and I'll ask but just wondered how your BH felt like and what your contractions felt like at the beginning.