I've been on ortho tri-cyclen lo for the past few years with basically no side effects and have been really happy with it. Just lately, I started getting my period (or spotting) about a week early, before I had taken the last week of pills. This has happened for the last 2 months. I went to the doc and they said it was normal even after I have been taking it so long. The doc said it was probably because the lo was too low and not carrying me through to the end of the pill pack. She switched me to Yasmin, which I've only been on for 3 days now, but decided to research it some. This website lists 4,000 replies about really negative side effects they have experienced in a short time. I am definitely getting off Yaz.....