I'm pregnant! Why is it such an anti-climax?

When I saw the doctor to tell him I was pregnant somehow I expected fireworks and party streamers or something. That's how it felt to me, I had just had the biggest and scariest news of my life. But he told me, "I'm sorry but it doesn't really get that exciting for a while. I know you've just had this life changing revelation but it's all a bit anti-climactic and nothing happens for a few weeks." Then he told me to take it easy, eat well, and wait for my letter from the hospital. Hmmm.