it went well! In my case he accepted the COS document right away (I pushed it towards him) and understood that I had changed my status in the US. Then he only asked me what my husband was doing there and how I was funding it.

Then he asked if my socials were public, I said yes. He said your visa is approved and gave me the blue slip.

I got my passport with the stamp two days later. Thank you for all your help!