I Have Had Intercourse With My Partener Last Week We

I have had intercourse with my partener last week we used the precautions bt there was little doubt in my mind so i took the pill bt after 6 days it has started bleeding and its been 3 days i m am very worried though i have never faced a problem related to my periods and this is 3rd time i took the pill after 1 year and i have read a article that one girl had to go through it for one month and my question is how many days it last as i m very much worried for its stoppage time plzz reply me as soon as possible and I am sure about the fact that there is no pregnsncy problem because we checked the precautions it was all fine bt i m cobcerned abt this bleeding..help me plzz what should i do? Does it last for a month?