Wrong pill start?: If you started retaking birth control pills 3 weeks ago, about 21 days ago, it sounds like you started taking them at the wrong time, i.e. just before your period was due. That could have caused this long delay in expected menses. BC pills should be started the day you BEGIN your period, or the Sunday following. I think all you can do now is continue; the symptoms you have would not be unexpected.
Answered 10/4/2016
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