Birth Control and Missed Period

Okay so I've been on the POP for about 3 months now, I may be about 2-3 hours late taking the pill even though they say take it at the same exact time each and every day. Stuff happens to where I forget and may even have to double up the next day. Well, my partner and I use condoms but like halfway through, he likes to take the condom off and pull out. I still have periods with this POP but I haven't had it yet. Do you think I could be pregnant or just having an irregular month?