Withdrawal bleeding question

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I'm sure this has been asked before..if so I apologise..but okay. I have been stacking my Lo Ovral. I probably haven't taken the placebos for at least a month, probably two. I thought my body accepted it, I hadn't had any bleeding or anything..but today after I had sex, I found some blood :(. Is there anything at all I can do to stop this? How long do you think it will continue to bleed? Until I give in and take the placebos? If so, do you think I could just take the placebos for like 3 or 4 days, and then start the hormones again, or is that not enough? Thanks. You guys are great.