Hi Ladies, I used a cbfm and I got my BFP on my 3rd cycle of using it. I personaly found it really useful. I lent it to a friend who was trying for 2yrs and got her BFP on her 4th cycle! Its not for everyone, and some people use it for years...which can be costly! It doesnt guarentee you pregnancy...nothing can, but it can up yours chances and reduce time of TTC.
I was on a useful thread when using it, I will try and find it for you. It covers the statistics as well...it has generally good results. x
https://www.babyandbump.com/ttc-groups/563579-cbfm-thread-statistics.html?highlight=cbfm+statistics