Vasectomy Reversal Question?

I am 20 and want to get a vasectomy, i have already called my insurance company and they said it's covered 100% it's just a $20 copay. If i get the vasectomy and god forbid years down the line want kids and get it reversed. I know how much the reversal cost. What are the chances of getting preg the "old fashion" way. Also, if i can't do it the old way if i donate sperm can i IVF with the donation or is it if i can't do it through i can't do it through IVF?