Hey Flossie,
I'm sorry that you had a scare , but I would try not to worry. Your OB sounds really nice, and I'm sure that he wouldn't take any chances with Jellybean. I'm sure if he was the slightest bit concerned that he would want further tests done.
Sorry I don't know anything about a Echogenic Focus, but I'm sure little jellybean is just fine in there.
Keep your head up girl, just keep looking at those little pictures you got of him/her, that should cheer you up.