Help, lower abdominal pains

So I'm 21 weeks and I'm having these light cramping kind of feelings, around where my pants would be buttoned, I currently wearing pjs tho, and all around that are it just kind of hurts, no bleeding or spotting, and my little boy is kicking like crazy, I thought round ligament pains were sharp jabs so I didn't think that's what it was, should I be concerned, TIA!