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Originally Posted by Amber_lv
If you start taking the pills the day you start you period you are fully protcted and if you start the sunday after you start your period you have to wait 7 days to be protected. It's all the same hormones just different brands of pills it shouldn't matter if you switch you just have to follow the directions about it use protection for 7 days and you will be fine
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No I promise. It is NOT effective right when you start taking it. Trust me. And they are not all the same hormones. They are all different levels of hormones and some have just progestrin and some have estrogen and progestrin. You have to wait a full month (at least) to be fully protected. It's just like when you start taking birth control pills for the first time after never have taken them. There is that waiting period for the pills to be 99% effective.