If you come in with your girlfriend who “might be” pregnant who’s also having some abdominal pain, good.
If your main concern is the age of the baby, “…cause I want to know if I’m the daddy”, you have a LOT more problems than a pregnant girlfriend, so not good.
When the sono shows a fetal age which is outside your range of, well, courtship, do not then start yelling at your girlfriend. Bad. Really bad.
I’m glad I was able to share that with you.