hi so i been on birth control 21 days pills novynette for years but i been taking it wrong (i think)... i take it from the 6th day of my period and it supposed to be from the 8th day... in December i had sex and took plan b my period came normal in January... in February i had sex (protected) but the condom slipped so i took plan b 9 hours after... when i got my period in February i decided to take my birth control from the 8th day (because that was the right way)... now my period is late by a day and i wonder why? is it because of taking the birth control late? or the plan b... also my period use to come after 3 days when i finish a pack... is it suppose to come the day right after i finish a pack now that i going to start taking it on the 8th day when will my period come?