Early Period! Started on birth control 4 months ago and it comes early EVERY month

I started on Alesse 28 four months ago. On my first month my period came two weeks early and ever since then it has come between 5-8 days early. I don't know how to get the placebo pills and my period to line up instead it feels like I have it for 2 weeks because it spots for the 8 days and then comes for another 2 days on the placebos. Do I need to switch medications? Or is there something I can do to get my period and the pills to line up?