Braxton Hicks

I'm almost 24 weeks and for the past week or so I have been experiencing what I believe to be braxton hicks.

My uterus tightens and It is hard to breath for a second or so, but everywhere I read says that they should not be painful.

Mine have been sort of like cramps along with the symptoms above. They happen every few hours and only last maybe a minute a piece and maybe three in a row at most

Are they Braxton Hicks or should I be worried?

Anyone else have painful Braxton Hicks??