So a little back story, my hubby and I have been trying for 28 months, no success on 150mg of Clomid. I'm currently on Metformin now and did 150mg of Clomid with it. I had an ultrasound today and I had 1 follicle at 16.2mm, and last month the largest one only got to 12mm. My doctor said I'd probably ovulate in 4 days if it continues to mature. That being said when would the best time to have sex? I can't use opks since I have PCOS. (Gives false positives)