Will you "confirm" pregnancy w/ your doc?

Betty
I've taken like 20 hpt's so far. And I am definitely expecting. When I called my OBGYN they scheduled my first apt. @ 7 1/2 weeks which is considered early for them. (I am hypothyroid) 
No mention of going in to confirm the pregnancy but I am seeing that a lot of girls do that? Is it mandatory? It's my first pregnancy so I am still learning..
Will you wait it out until first US or are you going in to confirm?? What are your reasons? Thanks!!!