First cycle IUI

Hi everyone, had my ultrasound Sunday after taking letrozole for CD 3-7 I had one follicle of 16mm 1 of 14mm, 10mm and 12mm. They told me to trigger on Tuesday night for them to grow a bit more. The nurse said they grow 2mm a day. So my 16mm will be around 20mm and 14 will be around 18mm hopefully. Wanted to hear of your success stories and the size of your follicles! I'm hoping it catches the first time...