we discussed this very thing today in our 4 hr session of Prolog questions with an OB attending. If you bleed early, you need more estrogen. If you bleed late you need more progestin -- a three-month trial of which ever is appropriate may lead to regular cycles without the additional hormones. My understanding, if you aren't bleeding in the placebo week, your pills may or may not be an effective form of birth control...if it were me, *I'D* check it out......since at least for me, pregnancy at this point is NOT an option.
EDIT: WhatI meant by "bleeding early" was in abnormal bleeding in the first half of the cycle; "bleeding late" is abnormal bleeding in the second half of your cycle. And yes, any bleeding on an OCP during the active pills is "abnormal". Sorry for any confusion.