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i normally get my period around the 13th of the month. in decemeber i started a new birth control, and got my period the 18th. it's now the 29th of january and i haven't gotten my period for this month yet. i've also been taking biotin vitamins with my birth control without consulting with my doctor, so i'm not sure if that would have an effect on my birth control. i had unprotected s_x on the 13th and took a dollar store pregnancy test on the 24th and it was negative(although i read a lot about the dollar store test and people seem to swear by them and say sometimes the line is very very light and i didn't look very close at mine). for the past week i've been light headed, dizzy, and nauseous. i have also been getting the chills and having hot flashes. i was planning on taking another test next friday if i don't get my period by then.