The day after me and my boyfriend had sex im having an upset tummy feeling. he pulled out. what does this mean?

Upset tummy: You didn't mention what sort of birth control you use, if any, but the cause of your upset tummy can be due to many things, ranging from pregnancy (presumably this wasn't your first time) to bladder infection to sexually transmitted diseases (if he hasn't worn a condom each & every time). So go see your Family Doc or GYN for evaluation & appropriate treatment. Maybe it's coincidental heartburn or