sprintec

I've been taking sprintec since September and I have had unprotected sex before and it has worked. this month I had unprotected sex twice, Ive never missed a day but sometimes of off by a hour or two, I was suppose to get my period today but it has not come and im worried. I would think thdt by now I would be regular and I have been but I don't. can someone that takes sprintec help me out like what are the odds im pregnant ?