Clomid and IUI

Autumn
So I'm currently on round 3 of clomid but we switched from 5-9 to 3-7 this month. We are also going to try <a href="https://glowing.com/glow-fertility-program">IUI</a> for the first time. However, my doctor will not make sure I am ovulating before doing the procedure. He just booked me for CD 15 but now I'm panicking thinking I'll ovulate before that. What CD did you ovulate on clomid 3-7?