Hey ladies! I need some help!

I’m currently 17+6 with my second baby.

I’ve noticed the past couple weeks when I do something strenuous (like picking up my toddler, carrying his car seat, or just exerting myself in any way) it feels like my uterus is balling up really tight... it doesn’t necessarily hurt but it’s not the most comfortable and it’s sensitive to the touch.

Is this Braxton Hicks contractions? I did not experience this with my first pregnancy. Is this something I need to contact my Dr about?

Advice needed! TIA!