Should I be worried about this abdomen pain?

I am 16 weeks and 2 days pregnant today. In general, I have been getting sharp pains in my lower abdomen, kind of where my thigh meets my lower abdomen. I know these are probably ligament pains. Last night I went down this huge slide with my 2 year old. It was blown up like a jumper is so the entire thing is filled with air, you slide down fast and hit this padded air thing at the bottom. Any-hoo, right when I hit that thing with my son, I felt that sharp pain in my lower abdomen again. I had cramps all evening after that. Now today, I am getting a mix between the sharp pains and cramping. It hurts to pee or, you know, push anything out. It hurts to carry my son or bend over, even walking hurts a little. Do you think I may have just pulled something or should this be a cause for concern? I know my baby is still moving because I can feel him t here and there. Thanks for any advice to this worried mom! :)