am I pregnant!!!!!

So I just started birth control last month and I usually get my period on the days between the 27-31st and last month it didn't start till the 31st since then I have taken the pill everyday and I'm already on my second card thingy. But I haven't got my period and it's been a few days I have had sex but it's been protected with a condom and he's pulled out before he cums we are both very cautious with sex because we are both younger. So I'm just wondering if birth control can delay or even make you miss your first period when you just start the pilll someone help!!!!?????