Late ovulation - pregnancy still possible?

Jennifer • Diagnosed with PCOS at age 17, have been TTC for 3 years. Have seen a reproductive OBGYN and reproductive endo.
Was on clomid this past cycle and went in for my day 13 ultrasound a couple of weeks ago. My follicies were a good size and my doctor said she thought I would ovulate within 3 to 4 days. I took LH surge tests and I got a positive on day 21. That's awfully late, but is there still a chance of pregnancy if ovulation occurred that late?