ultrasound while spotting

Vanessa
Hi all!
I am new to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> and this is my first post ever. 
Over the past few years my periods have been super irregular and my husband and I have been trying to have a baby with no luck. So I finally grew a set of lady balls to get some professional advice. 
I have to get my hormone levels tested on day 20 of my cycle (we all know how that works out with these extra long irregular periods) and I've been booked for an ultrasound next week to look for any bloackages, cysts, etc. 
I'm spotting a little and wondering if anyone has experience with getting an ultrasound while spotting? Is that ok? Should I rebook the appointment to when I'm not? The problem with rebooking is I live in a small community and it could take weeks to get another appointment. 
Thanks for all the replies in advance :)