Well, May is pretty convincingly 14 days, except that you have a day of fertile CF on the spike, but most likely 14 days. No April chart? March does not have enough data, IMO, to pinpoint ovulation. Yes you have a spike, but it dips drastically, there's no CF data, and you didn't continue temping throughout your supposed LP to see if you got another patch of CF and another spike a few days later- which I'm almost willing to bet you did. I would not count that cycle as accurate enough to include in your stats at this point. February is pretty likely 10 days though again there was minimal CF data. So you have 9, 10, and 14. Usually your LP will only vary by 2 days so I'm still guessing that things are regulating.  A few more cycles and charts I bet will allow you to better see your true averages. I would not be surprised if your body is working toward a 14 day LP, but is still falling short hormonally. It doesn't mean you can't conceive, just that you'll need to catch that egg on a cycle that was going to have a 10+ LP (without spotting).