Early menstrual cycle

Hello! I started Alli this past Tuesday. I have been on Birth Control (OrthoTricyclen Lo) for years and years and my period has been like clockwork. For the first time in I don't know how long my period came a week and a half early. I'm just wondering if this could be a side effect of Alli or if it's just a coincidence. Does anyone know? Has this happened to anyone else? Not sure if I should be concerned.
Posted to personal experiences (Forum) by urber3 on 07-08-2007