Follicle maturing?

Ha
Hi all! 
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) 

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors