I am on the Pill, but my period keeps coming mid-pack. Why??

I had been on the Pill pre-op with great success. I have PCOS, and it really helped regulate my system. I KNOW that because of my weightloss (I am 4 months out, 52 pounds down, Open RNY) my hormones are going crazy. I understand that estrogen is being naturally released from all those cells losing fat. But why aren't my pills (Ortho Tricyclin) helping keep my cycle regular? I've started my period on the third week of my last two packs- is it that this brand isn't effective now? Should I wait and see if my body adjusts? Thanks for your help!

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