Why is ultrasound considered URGENT?!

On Monday I had blood drawn to confirm positive pregnancy test. The result was sent to me along with a note stating that something should be seen due to levels found and an ultrasound has been ordered. But I'm confused because the levels weren't specified and when I called to schedule ultrasound the receptionist placed me on hold and stated, something "urgent" but then she said the physician just wants to see how far along I am. But then again if you notice below - if bleeding and pain worsens... I have neither. I feel fine aside from occasionally nausea and fatigue.  I'm anxious and I have to wait until Monday to find out if something is wrong. 😞 What do you think?! On Mon. January 4th I'll be 7w6d. Do techs and physicians normally send mixed messages as such? 🤔