I tend to think each part is independent: USCIS, NVC, DOS, GUZ, somehow... I never knew it was so hard to get your loved one to be with you before this process. It's hard enough to find the person you can fall in love with... The wait can be unbearable... You are really just two days from NVC in, I think you will be NVC out very soon, should be in couple days if not today. Shouldn't worry about it