Is this braxton hicks?

[owltrousers]

22 weeks tomorrow.

Have had a bit of a painful bump/abdomen last 2 weeks, kind of feels like muscle ache you get from excercise.

Today I've felt a weird tightening sensation every couple of hours, it kind of feels like baby is pushing its back into my bump and making all the skin and muscles go tight just where my belly button is. Its not painful, just uncomfortable.

Is it braxton hicks?

Yes, sounds like BH to me. I remember the thing when your bump goes rigid. Really weird, but totally normal.
Congratulations BTW.