I've been taking my temp this way for about 10 mths, and never had a prob seeing ov. I was only taking it during the day to see if it was giving me temps that seemed odd (to see if the 'first thing in the morning' ones could be odd too), not to prove anything by it.
I just took it again - 36.7 - so apparently I'm not any warmer after being awake & moving around for an hour than I was when at 5am this morning.
ETA: and I know its not the best way of doing it, but its my compromise between knowing and obsessing...

I did it properly for about 3mths before I started cutting corners.
Edited by jessm