I don't think I'm ovulating...

My husband and I have been trying for over a year, just thinking it's going to magically happen, like our first child did. But we've had no luck. I teach kindergarten and everyday look at those children as if they're my own but I'm constantly and quietly yearning to be pregnant. It's all I want! I've come to the conclusion that I can't detect a certain ovulation time in each month I show no signs. I've taken my temp, I've tracked my days, my cm and nothing is a definite sign. I'm going to try taking liquid iron and maybe kelp to boost my energy. I eat a vegan diet, I live a healthy lifestyle. I'm driving myself nuts! Send help.