There is always a risk of pregnancy even when using your birth control method perfectly. However, your risk is less than 1% since your boyfriend also withdrew before ejaculation. As long as you are taking a pill around the same time every day, you have continual protection against pregnancy even during your placebo or inactive pills (the last four pills in your pack). You only need to use a back-up method (like condoms) for the first seven days of your very first pack, not subsequent packs.
21. March 2012
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