I didn't really experience Braxton Hick's contractions with my son so I don't know what they are like exactly. I'm 19 weeks and I've been feeling a real tightness in my belly. My belly doesn't feel particularly hard on the outside but inside it feels so tight almost all the time. It's very uncomfortable and makes it hard to catch my breath. I sometimes feel a bit tight in my chest too. What does this sound like? Braxton hicks? Cramps? Gas? Something else?