twilight Don't worry about being grumpy and sharing your misery here! That's what we are here for 
shasha I used the One Step cheapie OPK tests, and I always found that the test line would never ever get as dark as the control line. So for me, if there was a second line, I took that as a positive. Sometimes, the line might change within a couple of hours, so if you get one, it might be worth re-testing the same day. Evenings are better than mornings because the ov hormones are produced when you're awake (never understood how that worked, though, as with the Clearblue monitor, you have to use fmu).
I'm a big fan of the FF app, never used any other. But I think that with any app, you have to look at it with a grain of salt when interpreting the output. If anything, they make you more aware of what is going on with your body, which I reckon is a good thing.
Urgh, I am swamped with work, no idea how I'm going to finish this all today!