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Actually, what you are experiencing is exactly what the other women have experienced too, and the answer is the same: Plan B can cause a period to start early or late (usually by just a week), and it can also cause spotting or breakthrough bleeding. I know it is bad timing to not know when to expect your period, but Plan B is just a "mega dose" of hormones that can effect your bleeding pattern in this way.

The downside to taking emergency contraception--it can alter your cycle for a month (perhaps two). It's not harmful, and this "downside" is much better than the possible consequence of not taking emergency contraception. It does not mean you ovulated earlier necessarily, but it does mean that you will not know when to start counting or keeping track of your next period for October. Your cycle should be back to its previous state/length by November.

You can read more about emergency contraception side effects at: Emergency Contraception Update, 2010

October 10, 2010 - 7:18pm

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