Anonymous wrote:Also try the ovulation predictor strips. The First Response smiley face ones are the most expensive but also most user friendly. I used wondfo's to narrow down the window then FR when I was close.
I did use the FR smiley face ones last month. Never got the smiley.

Then I read that some women test 2 or 3x a day to nail down the surge, so I was thinking about ordering the Wondfo's for that, using the FR to confirm.
So, the question is that if I'm getting EWCM on CD16 - CD18, when should I start testing with the Wondfo's? CD 12 or CD13? Too early?