"i am writing this because reading this forum helped me to calm the fears swirling through my mind! i am on birth control and was 1 day away from taking my placebo pill but was scared of &quot;what if&quot;. i had unprotected sex friday night and sat morning, i took plan b sunday morning about 32 hours after contact. i did not know much about my cycle and my doctor explained that on birth control i would not have ovulated so i could not have gotten pregnant. my period was late by 5 days but i was never so happy to see it after 5 negative pregnancy tests and one negative blood test. the pill will throw off your cycle so if you are late take a deep breath! also lesson learned and bought my own condoms!"