Was there a double space shuttle launch?

No. There has never been a double space shuttle launch.

The closest NASA ever came to this was scheduled for May of 1986 when 2 planetary probes were to be launched from shuttles in the same week.

However, NASA has had 2 space shuttles out on the launch pads at the same time several times. First in late 1985/early 1986, and the last in 2009.