your birth control is not going to work right away. and you have been taking it for only two weeks. even if you were taking them forever you still have a chance of being pregnant thats why you should always use condoms in addition.
if your period lasted 13 days ago..and you have been taking it for only two weeks (thats 14 days...) you have been bleeding the whole time you have been taking them? thats odd. and for most pills you take them the sunday AFTER your period starts.
you have a chance of being pregnant. start using condoms and give a call to your doctor being that you have been bleeding the whole time
and you just had unprotected sex yesterday. you have the option of taking plan b
Well birth control pills can mess up your cycle, maybe why your period lasted 13 days. I doubt you ovulated around this time, because a women with a normal cycle usually has their ovulation day about 2 weeks after your period, so I wouldn't worry about ovulating at this time. Did you take your pill the day you had sex or no? Don't stress too much until you miss your period, but you did have unprotected sex, so it's not impossible. Good luck!