Strange?

Jennifer • Married 4 years ❤️ Expecting twins in February 👶🏼👶🏼
20 weeks with my twins and I've noticed when I walk around more then normal (at the mall and places like that) my stomach gets so crampy and uncomfortable. Not necessarily down below (although a little bit there) but mostly the sides. Like a just ate a huge meal before being active. Should I be concerned??!!