UPDATE: Mystery solved. I have my answer and it is...

THREE CHEERS FOR DR BILLINGS!!!!!

I did O early as I thought. I knew it. CM has never proven me wrong. AF has arrived FIVE DAYS early!!!!! (No, eggy wasn't caught, we only DTD once and then I got thrush, damn thrush!!!)

[It really sh*tted me that when Dr Billings died the media focused on the high failure rate of the Billings method as a method of contraception. We should be celebrating the knowledge and control Dr Billings has given women over their own bodies in being able to recognise the signs of fertility.]

I love being able to tell when I am about to O. Here's hoping for better timing and no thrush at the crucial time next month.

WISH ME LUCK!!!!

[I hope I can O early next month too!!!!! Gives us more of a chance, fingers crossed, as then it can happen more often instead of being stuck with longish cycles.]