This is so confusing. here is what I found on the USCIS website:
https://www.uscis.gov/green-card/green-card-processes-and-procedures/affidavit-of-support
" Affidavit of Support For Fiancé(e), Spouse, or Child as a “K” Nonimmigrant
If your relative is either a K-1 fiancé(e), a K-3 spouse, or a K-2 or K-4 child of fiancé(e) or spouse, you do not need to submit an affidavit of support at the time you file your Form I-129F petition. Instead, you should submit an affidavit of support at the time that your fiancé(e), spouse, or child adjusts status to permanent resident after coming to the United States. "
So does this mean that I don't have to submit an affidavit at the time of the interview?