Could it be UTI?
Is it in your stomach or more towards your pelvic area? It could be pelvic girdle pain, maybe?
I had pain the day after my 20 week scan from all the prodding around!
This happened to me too turns out that my round ligament pains were just extreme due to stretching so I was getting cramps, and stabbing pains. I did light stretches to help with it and the cramps went away.
Could it be bloat?
It could definitely be from the scan yesterday as well as round ligament pain, but if you are concerned, you can always call your midwife team just to talk through anxieties :)
Call your triage and go and get checked just in case x