Every time I would miss a pill (or take it late) I would bleed for two or three weeks. Now, I'm trying to get pregnant and was a little concerned like yourself. After my period, I simply didn't get back on my pills and I havent had a problem yet....no bleeding! Its been almost a month so far. I hope that helps.
Yes in your situation I'd definitely agree - talk to your doctor.
Talk to your doctor to prepare physically.
Since you've had problems with coming off BCPs then this is probably something you need to talk to your Dr about. They can tell you the safest way to stop.