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Since you have taken an emergency contraceptive pill within 72 hours of intercourse, there is no chance of pregnancy. The bleeding you noticed could be withdrawal bleeding. You will definitely get your periods.
If you have a doubt then repeat your urine pregnancy test after a week.
I am very sure that there is no chance of pregnancy and the bleeding was just a withdrawal bleeding because of hormonal changes due to the pill you have taken.
Get back to me with the reports so that I can guide you further. Take care.
For more information consult an obstetrician and gynaecologist online --> https://icliniq.com./ask-a-doctor-online/obstetrician-and-gynaecologist