Pregnant and not happy about it

Husband and I have been trying for a bit and found out two weeks ago that I'm pregnant. I was really excited by the idea before but now I'm just so depressed. I'm questioning whether I want to keep it, I'm daydreaming about ways it might go wrong, and my husband is super excited as is my family. And I feel terrible for having those thoughts. And I feel terrible about all of it. I don't know what to do. Just looking for a little advice and comfort. I'm aware this is somewhat normal but how do I get through it?