between CD 11-15....I start testing about CD10...and after my peak reading I stop. So I use only 3-5 tests a cycle because I've been O'ing lately more on the 13,14,15. I can't see how it can mess it up too bad. After all aren't you testing to see the surge? I really wish they would allow programing in past charts and starting it up after CD5...sometimes I'm just busy and forget and I like to press the button giving me a later testing time because it seems to work better for me.
Best of luck!!
Michele in Ottawa (43) Dh (43) and kidlets ds 23, dd19, ds10, dd10 some homegrown some imported
2 Old English Sheepdogs, 2 Afghan hounds and a chihuahua