First all grain batch

Did a biab, I’ve never seen so much trub. It plugged my screen, I had to pull the wort off from the top using my autosiphen

 

Probably just milled too fine. Don't worry though, even if you don't siphon and dumped it with the trub, it settles out just fine.
Congratulations on your first biab.

 

Welcome to all grain brewing, especially BIAB
There are some ways of managing the amount of trub you get, hopscreens/whirlpools/finings etc, however best you get a couple of brews under your belt then start fine tuning these sort of things.