Birth Control Mysteries

I've been on my first birthcontrol ever. It's lutera. I've been on it for three months. This month my boyfriend and I finally had sex without a condom and he came in me and we've done this probably 8 times since that. I've only been missing the pill time by an hour or two at most. But I do remember to take it every day and haven't missed a whole day at all these past three months. I'm supposed to start next week and have been having really bad cramps earlier this week but they're on and off. I'm just curious: missing the pill time by two hours at most, could that make me pregnant??