I think the main thing to realize is that a 'match' is in no firm way a 'placement'. I'm sure you know this, but some agencies have a way of making couples feel that it's a sure thing 'if you're matched'!!!!! Not true.
This board is full of hopeful adoptive parents who were sure the pregnant lady was going to place; yet decided at the last minute to parent her child.
My suggestion is to speak to your boss; and let him/her know how tenative this process can be. I personally wouldn't quit my job, until relinquishment papers were signed and everyone was sure adoption was the plan.
As far as emergency placements: These have always been the favored way for us too. Thankfully, our last two babies have come to us this way...and it's been great.
My best to you and hope that your wait will be short.
Sincerely,
Linny