I had a friend who got pregnant shortly after I got pregnant with Erin. She was PANICKED about miscarrying, and most of the time it was unwarranted. She got so upset over the smallest little things, and came to me about it because I "understood the worry." It was really hard, since I was having such a hard time being positive about my OWN pregnancy, and I had a reason to be worried, and she didn't (it was her first pregnancy). I finally told her during one of the complaining sessions that she needed to shut up. I said "Honey, I promise you I'm a million times more worried than you are, because I HAVE a reason to worry. You're making this much harder for me than it needs to be. If you can't be positive about pregnancy around me, then I can't talk to you anymore."
It let up after that. I'm not sure if it was what I said, or she just got over herself, but you are definitely not the only one who feels that way. I'm sorry she said that to you.