I've used okp's and find it so confusing so I hope that's not the case with u n that u don't miss the surge n of course that its not a Sunday. As for the bding I have no idea how that works..my RE wants at least 2 days of abstinence
Yeah, I find it very confusing, too! I'm not even sure what's considered a positive. I saw two lines this morning but the test line was a little bit more faint than the control line so, I wasn't sure if that counts or not.
I took some pictures and emailed it to my clinic. The nurse told me to test again tomorrow as it's only considered a positive if the line is just as dark or darker than the control line. I was a bit confused coz after the doc told me my follicles only measure 13mm I really didn't expect to see any line there. Especially not such a clear line!
I only used OPKs during one cycle a few months ago but since my cycles vary length wise between 28 - 36 days I didn't test on the right days (only got 5 tests) and never even got a faint line. So, I stopped using OPKs coz they're simply too expensive here!
So, don't know how long it usually takes for the line to get darker.