Braxton Hicks 12 Weeks

Brittany
So I'm a FTM but I'm almost positive I just had a Braxton Hicks contraction. I all of the sudden had this tightening in my lower abdomen and uterus, and my uterus felt hard. Then after a minute or so it went away. It seems really early but from what I've read not unheard of. When did you first feel them?