Could laughing hurt the baby?

I'm having a PJ party with a friend and I started laughing and then I couldn't stop and I kept laughing, like hard laughing. Now I'm getting sharp pains on the sides of my belly and I'm worried I could have hurt him. I felt my abdominal muscles were contrating a lot. I'm 16 weeks. Would the baby be hurt by all the "shaking" of my belly?