iv been on birth control on and off (taking it a couple months at a time, and be off of it months at a time) for about a year and a half, its my first time being on it. I have never missed a period and have been having them since i was 13 and im now 18, the last time i took birth control, i was on it for two months, this past may (mid may) to the end of june, at this time i was havin sex with my boyfriend. i had my period early july, like normal, and still havent had my period and it should have came around the 14 of august, i have not had sex after july 7th, i have noo pregnacy symtoms, and feel normal. Im not under any stress didn't loose or gain alot of weight, the onlything thats a little off is my sleeping schedual. WHAT COULD BE WRONG???? :-( ?