I have 14-- 12 of them are UFOs and 2 are WIPs. I differentiate this way. If I worked on it at all this week, it's a WIP. If not, it's a UFO.
By the way, I am counting all those lovely tops as UFOs. They are hanging in the workroom closet, patiently waiting. They need quilting, while I do client quilts ahead of them LOL.