if you don't get the morning after pill within 72 hours usually a doctor won't give it to you. and as joy said....it's a rare chance but it CAN happen. i've known friends who've gotten pregnant while on their periods.
Oh, and maybe you'll use protection next time?
I do not understand why anyone wants to have sex duing "that time" but that is besides the point!!!
Anyway, the morning after pill is not something you should just go off and get because you're scared. It is a high dose of hormones meant to cause a girl to miscarry/abort if an egg was fertilized. It can cause her to have abnormal bleeding.
I highly doubt you are pregnant. It is possible but VERY RARE to become pregnant during a period. Just take it easy and don't freak.
anytime you have unprotected sex there is a chance of preg,