I used the LC ones this time, and if I got a positive OPK at night then I would get my temp rise on the second morning after the positive, and if I got the positive early arvo then the following morning i would get the temp rise. I was trying to pinpoint EXACTLY what time of day I O'ed for gender swaying.

I had a big box of the LC ones so I tested every day for a month and found that I O'ed later than I had always thought, so I used 15 before I even got a faint line and then the next day it was very dark so that was the positive.