Sooo quick question

Monica • First time mommie & I'm having a boy 😊👣 mommy can't wait to meet you
I do alot of walking & I always get these like, IDK how to explain it there not like cramps it's more of a feeling like my muscles in my stomach tighten and it hurts. Sometimes I have to stop and take a break is this a sign to slow down on the walking? 25 weeks