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The early periods could have been the withdrawal bleeding that usually occurs within 5-7 days of taking the emergency contraceptive indicating that the pill has worked (which could be the cause for the bleeding she experienced). Since the emergency contraceptives contain high doses of hormones, these can disrupt the normal hormonal and period pattern. The brown discharge could also be associated with the hormonal changes. Wait and watch for your next periods. Visit your doctor/gynecologist for further evaluation if periods do not start within 10 days or if you suspect chances of pregnancy, or if you develop any other new symptoms suggestive of early pregnancy.
Withdrawal method, condoms, safe period/rhythm method of contraception etc., can be associated with high failure rates. If pregnancy gets ruled out, and if you are not ready for pregnancy, but intend to remain sexually active, you should 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 if you are not ready for pregnancy. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.