Letrozole 5-9 and the IUI day 13, too early?

Doesn't this seem too soon? I took letrozole day 5-9 had u/s day 10. Had 3 follies one 18mm, 16mm and 13mm. They had me trigger day 11 at night and did <a href="https://glowing.com/glow-fertility-program">IUI</a> day 13 early morning. Does this make sense?