hi i am 23 years old . i use Diane 35 i recently finished my first pack .i started Diane 35 on the 2nd day of my period. i didnt missed any of my tablets and took it on the same time sometimes an hour later but took all the tablets .on the 14th day of the taking of the tablet i had an intercourse without any protection but took my tablet on that day also but now iam worried of being pregnant because as my doctor told me i should experience bleeding after taking 21 tablets within 7 days band today is the 3rd day but till now i havent .