I Had Sex On 16th May Bt Condom Broke And

I had sex on 16th may bt condom broke and i urinated as soon we realised...bt for protection i took unwanted 72 within 1 hour and next day i.e 17th bleeding occured just after 24 hours.
I usually get periods on 20th. Its been 7 days when the bleeding started and has not stopped yet and flow is light...is there something to worry? How long will bleeding last? When would i get my next periods?