<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi I took levonelle a day after having 5 days of unprotected sex. My period then came a week early and only lasted for two and a half days and much lighter than usual I had no pain, or any symptoms I usually get with my period. I checked the fertility calculator and saw that during the days I had sex they were my most fertile days. My period was due yesterday ignoring the two and a half day period. Im not sure whats going on.  <response>: Hi, If you had regular unprotected intercourse during the fertile days, then you have pretty good chances of being pregnant. A single tablet does not and cannot cover all those days. Yet, the fact that you had some bleeding points to a with Chat Doctor. I would suggest that you get help if you do not see your period within a week as pills can alter the menstrual cycle by disrupting the hormonal balance. Hope you find this information useful. Take care. 