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Plan B and lower back pain

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I have never been on birth control in my life, and have a regular period evrey month. So, I started my period last Thursday, and then Friday night I had unprotected sex, so Saturday morning I immediately went to get Plan B. Even though I am on my period, I wanted to get the pill because I was not going to risk anything. I took the first pill and the second pill 12 hours later. At first I had cramps, and then I took a nap and they went away. It is now Wednesday, 4 days after taking, and I am still bleeding. But, I have read many posts online about women having irregular cycles and cycles lasting longer and so forth, so I think this is because this is the side effect of Plan B? I have never taken Plan B before, and today (Wednesday) I am experiencing some lower back pain. I am wondering if this is considered an expected response to Plan B? I have experienced absolutely no vomiting or abdominal pain whatsoever. It has just been my lower back today. Thanks.
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replied March 4th, 2010
Hi there. Thanks for posting your question on Ehealthforum. There is quite a high dose of estrogen and progesterone in post-coital contraceptives. What you are experiencing is withdrawal bleeding. Check this out with your own GP.

Andrew Rynne.

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replied March 5th, 2010
Thank you for your response. So, the withdrawal bleeding is because my body is shocked by the pill, since I have never taken a birth control pill, and it was such a high dosage at once? I took Next Choice specifically, not Plan B. But, how long does this back pain/ withdrawal bleeding last for?
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