Questions! First time IUIer

Hi ladies! I’m looking for some insight as I forgot to ask specific details when I saw the doctor last Friday.

My hubby and I are going thru the IUI process next month. I will be taking 2.5mg letrozole on CD 3-7 and then will be having an ultrasound to check follicles on CD 12. I forgot to ask what day a trigger shot is typically done. He may have said and I didn’t write it down, but I’m lost and am trying to put together a rough estimate of things for my work schedule. Any advice?

Also, my doctor does IUIs two days in a row. Anyone have any experiences with that? Do you pay for the IUI twice if it’s done two days in a row?