I am a 27 years old female. I have been on contraception pills (Novelon) for about 1.5 years now. I have a steady partner and till date, my withdrawal bleeding would start on Day 4 of my pill free week. However, during this month's pill free week, we had mutual intercourse and he ejaculated inside. I knew I was protected from pregnancy during the pill free week but as we rely on pull out method, I decided to take an iPill. But after that, I didn't get my withdrawal bleeding. 2 more days left before I start a fresh pack of my contraceptive pills. Should I be worried?