Braxton Hicks

What do Braxton Hicks feel like?

I’m 22+4 with my first pregnancy. My uterus has felt tight and tender (more than usual) all morning and I don’t feel as bad when I lie down, but when I’m sitting up right or standing it’s a bit uncomfortable. It doesn’t feel painful per say, more like a cramp feeling. Does this sound like Braxton Hicks contractions or something else I should be worried about?