congrats on the pregnancy.
my 1st hospital app was disappointing. They discussed pervious history with 1st preg and delivery. Took my weight and height. Talked about how I was feeling and we asked questions on possible VBAC.
Then they said come back at 20 weeks......
I was upset as I saw Dr every 4 weeks with 1st preg this time it is different.
I have my 1st scan on wednesday but I booked that seperatly as my hospital doesnt offer 12 week scan only a 20 week one.

Good luck I hope your app is more exciting than mine. If they say to allow 3 hours it prob will be more thorough