It means Fertility Awareness Method, here is a link to it.
http://www.fwhc.org/birth-control/fam.htm
i tried googling it but nothing...i guess nobody knows
I was curious about this too b/c I had 0% last month and figured it was b/c the FAM and SELF didn't match O date.... actually, MY coverline was also only guesstimated @ 97.4 but medhelp's FAM had me @ 97.8.
This month we have the same O date and coverline but it says FAM agreement is 50% so now I'm 100% clueless ; )
Thanx for asking.... hope we both get an answer! sorry I couldn't help tho!
If mine was 0% last month and didn't match and then matched exactly this month, that would be 50% of the time, right? Well, that's my guess since no one else seems to know ; )