When I've gotten a few days sober and drank without consequences, it was license to do it again....and maybe again and then another again.....then the old pattern of nightly drinking took over.
I'd start day one now and keep moving forward with consecutive days of sobriety! In fact, that IS what I did this last time I drank and stopped.....coming up on 21 months of consecutive days of staying stopped now. This feels awesome!
Congrats on starting again!