20 weeks and pains

Hi mommies quick question, I am 20 weeks today and lately I have been getting like pains. It almost feel like in my stomach and the sides of my uterus if that makes sense almost feels like trapped gas that can’t be released it’s painful sometimes. I’m not bleeding or anything like that but it’s certainly a new sensation I have been feeling periodically in the last week. Has anyone experienced this or understands that sensation I’m discussing lol?