Birth control help?

So, I started taking Ortho tri cyclen birth control around the first of October, I had my period the normal days this month from the 7-11th but now ive been bleeding from Wednesday the 21st just like a period, can anyone clear things up for me and tell me when to expect my periods or why I’m having them like this, and I’m having cramps which I never have .

I take them everyday.

And what will happen if I just stop taking them, will my periods go back to normal?

And I really don’t know where to put this so I’m just gonna put it where I put all my other questions.