You have two choices. You can take it within the first 24 hours of your period starting or you can take it the first Sunday following the start of your period. Actually, starting it Day 1 gives you better coverage. Some birth control pills say you dont need back up protection IF you start the Pill the very day your period starts. The first pill has to be taken within 24 hours of your start of your period otherwise just start the Sunday following your period start and be sure to use back up BARRIER protection, like a condom, for the first seven days to allow the Pill to start working. The only time you worry about taking the Pill in relation to your period is when you first start. After that, keep taking it as it comes in the pack and dont alter your schedule no matter what your body is doing. Start the new pack when it is due even if you havent stopped bleeding yet. It is very important to stick to your schedule taking a Pill each day at roughly the same time every day. This will allow your body to regulate. It is not unusual to have irregular bleeding when you first start the Pill. This is normal and just your body responding to the changes in the hormones. It will regulate out in a few months and the best way for this to happen is to stick to your schedule! Once your body is regulated, your period will come the 4th week of your cycle as expected. On occasion you might spot or miss a period or start you period a different day than you expect but as long as you are taking your pills properly on time with no missed pills then you dont have to worry as you are protected as you can be. Birth control pills are about 98-99% effective when taken perfectly.
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