constipation question

I didn't think I was really having it but today I'm having pretty bad pains. It's even tender if I press down on my right side (not just one area but in general area). I called the on call doc and I don't feel like it's an urgent thing so I'm thinking it has to be constipation. Anyone else have pains on the right side with constipation? I never really dealt with it before so I'm not sure on how bad the pains can get. Thanks to anyone who has any input :)