Ovulation question?!

How do you know if you ovulated??? This is my 2nd round of clomid, and I was wondering if there is any sign or way to tell if I have ovulated or not?? opk don't work for me, I have a progesterone test on Friday, but by the time I get the results back it will be time for AF (hopefully she won't arrive)... The only good thing about the progesterone test in my opinion is they will be able to tell me the next step... Which last month was "you did not ovulate so we have increased your dosage"... Which I already knew I wasn't pregnant due to AF... So if I don't get pregnant this time around at least I will know if the Clomid worked or not.... But not being able to tell if I ovulated until after AF or expected AF is making the whole "tww" turn into a lot longer more agonizing ordeal.... Anyyy help is appreciated!!! I do know that when I had my follicle ultrasound I had one follicle on the left that was a size 23 and one on the right that was a size 20... If that helps!! Thanks ladies!