Tender belly :( *rant*

I'm 22 weeks tomorrow and this last week iv noticed "hard" spots on my belly.. like maybe his little head or butt or something pushing against it. but right where the "hard" sport is gets real sore or tender like its bruised. Then it feels sooo good if i put something warm (not hot) against it or just sit there and rub it. Since i work behind a desk i'm constantly bumping it, which makes it even more sore by the end of the day. I can only imagine when i'm 32 weeks or even 38/40, it's gonna be horrible! I go to the doctor tomorrow and plan on telling her then but until then....