My girlfriend takes Otho tri-cyclen lo and this month while taking the pill everyday she notice the week before her period she was a day behind on the order she was taking her pills. For example she was taking Thursday's pill on Friday, how in the hell this happened I couldn't tell you. Now we had sex unprotected like we always do this month, is there a strong chance that she could get pregnant from this mistake she made. Her period is 1 to 2 days late, is this from taking the pills out of sequence also she has been under alot of stress. By the way the pills that she was off sequence with were the active 3 week pills.