Me and my boyfriend had sex and he didn't have a condom on but he didn't even stay inside of me for 2 minutes and he did not have an orgasm. My back has been hurting, I'm gassy, and depressed. I can't determine if I'm constipated or not because I already have bowel problems. Is it possible that I'm pregnant??

It doesn't take long for pre-ejaculate to do the job. Those little devils swim real fast and there are just as many in pre-ejaculate. It doesn't matter if he didn't ejaculate fully.

How long has it been. You may be jumping to conclusions if it was less then 2 weeks. Symptoms of pregnancy would not show up that early.

If you don't have your next period, then I would start testing with first morning urine.