I've had similar problems with cycle length. LP has been anywhere from 10 to 12 days. Cycles from 24 to 30+.
I have decided to try some OPK to verify what FF is telling me about when I O, does that sound like a good idea? Definately, that really helped me with the charting CM and CP.
how do I use them? its the kind where I have to pee in a cup and dip. do I start at my earliest O date and just PIAC every morning?
I think most of the dipsticks suggest using them in the afternoon since LH builds up during the day. Check the directions.
should I do it at night, when we are more likely to dtd? Some people test 2x a day just to be sure.
what am I looking for. 2 dark lines means I am Oing or just about to right? two dark lines indicate that you will ovulated in 24-48 hours.
what about a light line? does that mean that I have already O'ed? You may see a light line before you ovulate and after you ovulate so it doesn't really tell you much one way or another.
Lots of
Jilda