Transmission problem

My transmission pan was leaking due to a bad seal. I decided to change the transmission filter and flush it. After putting it back together I started it the next morning letting the gasket dry and now it is like the gears are not catching. Sounds fine nothing clunking but it wont move in reverse or forward I was able to get it to catch enough to pull back up my drive way, but that is it. Any suggestions? Also I did have a nice amount of metal caught on the magnets in the transmission pan. Obviously I cleaned it off. Please tell me the transmission is not shot