Need help please!

Valerie • 33 years old. My husband and I have been ttc for 7 1/2 years. November 8th, 2016 I was diagnosed with endometrial cancer. I had a d&c with the Mirena placement afterwords. I received the call November 2017 that my biopsy finally came back cancer free. Feb
I have irregular periods so not sure when/if AF will come. Does anyone know by looking at my opk tests when I should be good to start testing for pregnancy?