I had a emergency contraceptive pill within 50 odd hours of unprotected sex which happened on the 28th. I started getting a brownish residue blood for a week and next week heavy red flow of blood.. I'm confused is it withdrwal bleeding or periods. I got my last periods around the 21st of April and this time I started bleeding on the 8th may and bleeding from 2 weeks. My age is 22years.. I took the pill on the 30th April morning. Can I still be pregnant.. As I've even bled for 2 weeks now?

And my boyfriend is pretty sure that there was no semen leaked alias he didn't.. What can be the reason of me bleeding for 2 weeks straight? Can withdrawl bleeding end and period start immediately..