Some words of advice please!

I found I'm pregnant last week and I haven't seen a doctor yet. It still really hasn't hit that I'm finally pregannt. Everyone keeps telling me not to worry about the bad things that could happen or go wrong in the first couple months, but how do you not worry? I'm trying to stay positive and still trying to get to the point of excited. I'm just a worrier! I keep thinking what if I'm gonna lose it, what if something is wrong wrong with it. I read some of the post from the ladies on here and seems like anything can happen. Any advice to stay positive?