tightenings/contractions!

39+3. Second baby. With my first I had back labour so unsure what contractions round the front feels like. I'm having pains, I'm not timing them or anything as I've only just noticed it. It feels like pressure on the bottom of my belly. Like someone is squeezing me. I have felt anxious and worried all morning even though all I'm doing is sat at home relaxing! It's not unbareable pain yet but I can defiantly notice it. I have had braxston hicks everyday for about three weeks now mainly on the sides. This seems to be right in the middle. I have been 1cm for three weeks also. Please help!!