In my case,
I did ds160 before the marriage, but got the interview date after the marriage. And the interview date was almost 2 weeks (this was still when you would go to Nabil bank to get dates), and we were flying back in a week. A simple email explaining the situation with copies of air tickets helped and they called for interview in 2 days and we flew in a week. It was close but we made it.
I would suggest file ds160 now, and get date after marriage. I think these dates you get dates online.