I've never used opk, but I've been tracking cm and cp for quite a while (to prevent for a few months). Just starting tracking bbt in the past 2 months, but I don't see much trending in bbt but I haven't been consistent in checking. Normal cycle has been 28 days. It's been pretty true to that since I quit bc in November of 2013.
Then a few months ago af was 2 weeks late, bought a test and then af came. The past 2-3 cycles have been 35-38 days.
Dh wants to ttc but I'm definitely more committed than he is. He and his x got pregnant their first try after she had her iud removed.. even before she got af, they never tracked or anything. He feels like it will just happen when it's meant to and doesn't want me to stress, so I'm working on it!!