I’m confused

Ok so I have a question about ovulation when it comes to <a href="https://glowing.com/glow-fertility-program">IUI</a> . Do you keep testing using opks to find out when you ovulate then you go in the office for the <a href="https://glowing.com/glow-fertility-program">IUI</a> ? Or do they give you the trigger shot so you know ovulation is 100% going to happen ? Please comment thank you