Ultrasound during period?? Help

Hi all!

I’ll be going through my first round of iui, and I called my doctor on the first day of my cycle(today) and they wanted me to come in tomorrow for blood work and an ultrasound but never had it done right(maybe because day 3/4 fall of a weekend?) after I started since I’m usually a little heavy the first two days! Just feels so strange.

Just feel really ugh about it. Lol any advice will greatly be appreciated!!