When am I due on?

Sharnie

Hey,

I came off the pill this month on the 2nd October, I bled on the 4th,5th and 6th. When am I due on? Normally I would have taken 21 pills, had my week break and then started again. So does that mean my period would come after 3 weeks like it did before or return to a 28 day cycle? I'm so confused!