Hi,
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The spotting that started after the use of emergency contraception could be due to the withdrawal bleeding that occurs within 5-7 days after taking the ECP. The prolongation of the bleeding/spotting is not normal. Wait and watch for your next periods (which might be delayed). If you miss your periods or get abnormal periods, consider visiting your doctor/gynecologist for further evaluation to look for the underlying cause. Treatment as appropriate (as indicated by examination findings and investigation results) would be started to help you regulate your periods.
If you intend to remain sexually active, 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.
Take care.