I have been on the pill 3 years. Missed for the first time a pill 3 weeks ago. I am skipping my period, so I didn't have any since May, so no way to tell if I am pregnant. However, exactly 3 weeks from ovulation/missed pill, I have light bright red bleeding. I was also feeling sick and dizzy last week, and I never feel sick usually. My partner and I had sex the same night I forgot my pill, with no backup protection.