I started spotting around 10pm Friday night, Saturday I had cramps and a steady medium flow, Sunday I had a light/spotting flow, and now today I've spotted all day. What could this mean? I read that I could possibly be implantation bleeding. This has never happened to me I normally have a medium/heavy flow for 4 days 5th day slows down until it stops. Just wanted to get others thoughts and opinions. Has this ever happened to anyone before?