Braxton hicks?

I'm currently 27, almost 28 weeks pregnant with my first baby and starting yesterday I began having weird crampy feelings in my belly (almost like zaps of light pain and muscle spasms) and my bladder was feeling really sensitive. I was on my feet for most of the day but I was just shopping?

I haven't had any plug or fluid come out either.

Is this Braxton Hicks? Should I be concerned?