IUI language

Elinika

Need help with deciphering what the RE says during ultrasound checks. I just had day 3 monitoring for my 2nd <a href="https://glowing.com/glow-fertility-program">IUI</a> and I would love to understand what they say. I feel like I lay there like an idiot and you ladies seem to understand what they say more than I do! So... if they say 18, less than 10 why does this mean? What are the key things to look out for? Thank you!!