Moving subscribers from wordpress to feedburner?

Just started on 2.7 and burnt a feedburner feed I have no idea if my old subscribers are getting my feed anymore. I can’t find any subscriber info in WP and feedburner doesn’t acknowledge them at all.

Does anyone know how to find my old subscribers and (ideally) move them over to the feedburner feed? All the documentation I had read said this would be done automatically, but clearly, that isn’t the case..

Thanks