Clomid ovulation questions.

​​I have PCOS and I am currently taking clomid 100mg cd 2-6. My charts look like I ovulated on day 9 but my opks haven't showed anything close to a positive. Could u have missed my peak day? Is it even possible to O on CD 9? I know the clomid can do some crazy things and PCOS can effect opks. I'm so confused. Any help would be greatly appreciated. Oh and the only monitoring my doc is doing is day 21 progesterone.