What are my chances?

I had a Transabdominal Cerclage on April 8, i had my first cycle after the cerclage on May 7 i have a 33 day cycles i was checking my bbt everyday since my period and started opks on May 16 and they were a light line until May 24 the test line was darker than the control line it was also dark on May 25 i took another on May 26 but it was only 1 line! Its says i ovulated on the 25! What do you think are my chances?