When did I ovulate?

Akashia

I have PCOS. My period started 4/25.. i did Letrozole days 3-7.. DID NOT produce any follicles.. My doctor then prescribed me Clomid on 5/6 for days 12-16.. On 5/13 I had an ultrasound and had 6 follicles in right ovary. On 5/16 I did a HCG trigger shot and 5/17 had my second <a href="https://glowing.com/glow-fertility-program">IUI</a>.. On 5/18 & 5/19 I had horrible ovulation pains ALL DAY!. my cycles are typically 35 days .. however this one is way different.. How do I know what day I actually ovulated? I’m confused on the timing ..