My last period started March 1st and I was on HBC when that came. I have since stopped taking HBC and I haven't had a period since. I've never really had to figure out when my period was due - as I knew when to expect it, being on the pill. But it's been over 5 weeks since my last period. I have read that this is to be expected and it can take several months for things to go back to normal...but what, I could get my period at any time?? I don't like this :-/
Btw, I have stopped taking the pill a few times before (usually only for a month or two) but my periods pretty much occured normally then. So why not now?