Eye of the North

I am ordering the expansion EOTN and my question is can I load the game while I am in the middle of Prophicies?

Not sure I understood your question sorry. After adding the eotn access key to your proph account, you can travel to eotn on any char above lvl 10 that has been in la.

You don't have to beat/finish prophecies, if that is what you are asking

all you have to do is add the key to your account... I don't think you even need to insert the CD.
you can go between campaigns at any time, as long as you have them unlocked. you can travel cross campaign with the ship once you've gotten to the main harbor, or the asuran gate to NF.

Yes. That is what I wanted to know. Thanks all.

Chances are you just have to add the account key to your account, dont go installing it since its prob in your dat file anyway.