Braxton-Hicks

Hi ladies! I am 26 + 4 today and randomly my stomach will get rock hard and then stop. It may last for just a few seconds and then go away... And it's all totally random! Nothing I can tie that would trigger it. I'm guessing this is Braxton-Hicks contractions? I'm a first time mom and feel clueless! I also have an anterior placenta if that makes any difference! Thanks ladies! I need some reassurance that it's normal!