The last thing you should have to do after sex is worry. If you're BOTH not committed, and not ready to raise a child TOGETHER please quit having sex. There is always a chance even if you use a preventative method.
Unless your ready to have a baby I suggest you don't repeat that behavior.... Go get the plan b pill
Anytime you have unprotected sex there is a chance of pregnancy. Plan B is your best bet at this point. Please be careful next time and use a condom if you don't want to get pregnant.
Yeah you should tHe a plan b if three days haven't passed and just take one just in case better safe than sorry.
If it was within 72 hours go to your closest pharmacy and get a Plan B pill....