That happened to me when I first started my ortho tri cyclen lo. The first two packs were hell. I just kept bleeding, but then the third, fourth, fifth, and sixth packs have been amazing. My period is sooo regular, I can time it on the clock, lol. Just give it a month or two longer, and i'm sure everything will be regular and fine!! Also, I dont have any breakthrough bleeding anymore! Wooohoo!