Braxton hicks.

I'm pregnant on my 4th child and have had some braxton hicks all ready!! I was nervous to be honest as I don't remember having them this early before. Also on my last pregnancy my water broke at 20 weeks, which is where I'm at now. Our son was only a month premature in the end and is now a healthy 4 year old. You would think as you have more children you get less nervous, not the case for me!!!
Has anyone else expierienced braxton hicks this early?? Would love my mind to be put at rest!!!!