being unemployed wont really matter at all when you applied for spousal visa, coz i was also unemployed before i submitted my application & it didnt affect my visa at all.
maybe, they just want to clarify things with regards to the docs that you submitted, which is much better rather than automatically denying your visa. As what others had said, bring some more extra proofs of your relationship to show to them just in case they want some more.
just relax & be confident when you're infront of the ECO!
Good Luck & continue to pray! I'll also include you in my prayers...