Most likely they'll collect your pee, do some blood work and ask you general questions about you anf your family history.
It depends. This is what happened at mine:
If you want an ultrasound you can lie and say you're not sure when you got pregnant, that's what I did because I still couldn't believe I was pregnant lol
They'll have you pee in a cup and ask you some basic questions to get your file started. They might also have you fill out a form beforehand with some information about your health.
Thanks ladies:) @debdeb1 @damiensmommy1117 :)