Kat, I have PCOs, and if you had that, too, you could not really have such beautiful BBT charts without medication.
That is why I cannot use opk, because when you have PCOS, your hormone levels are different (for example would show a (false!) LH surge on many days etc., because your LH level is higher) and you don't have an ovulation in every month, because of the hormonal imbalance the egg - instead of coming out - remains in the sac like pearls. It is because the lack (or low level) of progesterone. But also if you lack progesterone (or have a low level), you also have symptoms: spotting, AF cramps starting from 2 weeks, ten days before AF etc.
If you see the fertility monitors the disclamer says: not to use them if you have PCO, because it might not work.
How about your man? A friend of mine did not get pregnant for long time when the doctor noticed once that her husband use laptops every day for hours on his laps.... it is enough heat to kill the soldiers in an hour. it is only an example that sometimes the reason can be nothing serious. (They bought a special pillow and got pregnant in 2 months).