IUI timing advice please

Alix • Wife. Mom to Aria.

So I went Wednesday afternoon (CD 13) for follicle check. I had one follicle that was 13mm. Dr called & said take ovidril shot Sunday (CD 17) and <a href="https://glowing.com/glow-fertility-program">IUI</a> Monday afternoon (CD 18).

The I got a solid smiley face ovulation test (peak fertility) yesterday afternoon (CD 14). What do I do? Monday will be way too late but should we do it today? In the morning? Is it already to late? I'm terrible with timing. Calling the doctor when they open in a few hours but want advice.