Contractions?

Does this sound like early contractions? I have been having weird feelings and pressure around where my waist line of my pants would be. It doesnt feel like baby but not 100% sure. I am 38 weeks and 5 days. Also been having pressure in my butt. I was in hospital around 28 weeks and they picked up real, minor contractions on their monitors and I didn't feel them. They said they weren't Braxton hicks but real contractions. First time mom so unsure of this is start of labor or not. I've been pumping (with ob permission) and had sex earlier today. The pain and pressure is coming and going but in no pattern.