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plan b messed up my cycle that badly?

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I took Plan B on september 22/11. My last period came on september 19 was gone by september 20 (which isnt normal. Usually it lasts 4-5 days) had unprotected sex sept 21/11. My Period is on a normal 28 day cycle, which means i would have gotten my period oct. 17/11. Did not come and has not come yet. I have taken pregnacy test and a blood test both came back negative. Is there anyway the plan b messed up my cycle that badly? I have taken it once before and never had this happen! Help!

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replied November 4th, 2011
Birth Control Answer A28165
Welcome to ehealthforum,
If you have taken the emergency contraception or Plan-B within 24-48 hours of the unprotected sexual intercourse, it should work in preventing pregnancy (provided you were not sexually active without protection after taking it). Withdrawal bleeding usually occurs within 5-7 days of taking the emergency contraceptive indicating that the pill has worked (which may not occur if the pill has been taken very close to your last period). Since the emergency contraceptives contain high doses of hormones, these can disrupt the normal hormonal and period pattern. Wait and watch for your next periods which can be delayed. The tests done very early in pregnancy can show you false negative results. If pregnancy is suspected, consider visiting your doctor/gynecologist at the earliest for thorough examination (to confirm pregnancy related changes/signs in body) and blood/serum HCG level test (to confirm/rule out pregnancy accurately).
If pregnancy gets ruled out, further investigations would be needed to look for the underlying cause for your absent periods. Get started on treatment as indicated by your examination findings/investigation results to help you regulate your periods.
If pregnancy gets ruled out, and if you intend to remain sexually active (and if you are not prepared for pregnancy), consider visiting your gynecologist to get started on suitable regular birth control measures to be protected (after your periods). Be regular with birth control use as instructed. Avoid having unprotected sexual contact.
Take care.

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