Follow up question: what do you charting ladies do if AF comes at like 1030pm? Do you log that has day 1? I've always wondered about that. Most of the time, I go ahead and log that as day 1. The CBEFM says to set the monitor up for day 1 the following day, so that is a little confusing.
Re: FF- when do you start?
You can really start any day, but a new cycle would start on the first day of AF.
I started a few days after AF my first cycle with FF but it was still able to show my O day.
This and cycle day #1 is the first day of red flow, not spotting.
I would log it is Day 1 and maybe just make a note of when it started.
Sorry, I don't use CBEFM so I don't have any advice on that.