If you didn´t miss any day of the pill. neither vomited after taking the pill or had diarrea then you only have 0,01% chances of being pregnant, no matter when you had you´re period.The only exception is when it is the first month of taking the pill, then you should use condom for one week after iniciating the pill. after that is just enjoying condom free sex with only 0,01% chances of getting pregnant!