hi this is the information from your packet seems you did not read it. if this is the first time you are using this medication and you are not switching from another form of hormonal birth control (such as patch other birth control pills) take the first tablet in the pack on the first sunday following the beginning of your menstrual period or on the first day of your period. if your period begins on a sunday begin taking this medication on that day. for the first cycle of use only use an additional form of non-hormonal birth control (such as condoms spermicide) for the first 7 days to prevent pregnancy until the medication has enough time to work. if you start on the first day of your period you do not need to use back-up birth control the first week. if you have not read this as you can see you should have started on the first day of what would have been your next period you started a week early. and this is a serious answer. good luck
is it birth control or possible pregnancy? . birth control question.? . i had unprotected sex nov. 21 and then i started my birth control that following sunday nov. 22. i had completed a week of the birth control. my period was expected the week after but it never came. i have never missed a period and i have been on plenty of birth control. is this the work of the birth control or something else? i am on sprintec. serious answers only please.