probably Over reacting

Miriam
Hello so it's our first time TTC and we got really lucky and became pregnant the first month. Today I'm 4 weeks 1 say. Everything has been normal, but today we went to play pool and after a few hits my bottom left side of my abdomen started to hurt. No bleeding or anything. The pain is very mild, similar to cramps. Should I worry? Or could it be a fart lol or air pocket..help. I know I'm probably freaking out but we have been planning this pregnancy for six months