Hi,
I've been on Marlissa combined monophasic birth control pills for a year.
Last period on my last pack my period came about 15 hours early. My period this pack is due tomorrow and already started about 18 hours early.
I've never changed dosage or anything and I don't know why this keeps happening. I like knowing when my period will come. If anyone has any ideas that'd be great.

Thanks,
-G