I am on birth control (the pill) and I decided to skip my period last month because I was going on vacation. Because of the time difference, I also changed the time of day I take my pill (from 5:30pm to 11:00 am). During the first week of my new pack, which was when I should have had my period, I missed one pill resulting in taking 2 pills the following day. Since then I have taken all the pills on time. I had unprotected sex on the day the fertility calendar says I am most fertile if I were to have not skipped my period. Is it a good idea to take plan b? I have taken it in the past because of taking the pill inconsistently but I was wondering if this time that my most fertile day still applies since I skipped my period.