I have a friend doing that now too, if I weren't such a nice person I'd tell her where to shove it. Not every pregnancy is the same although she's figuring I'll end up spending my entire pregnancy in pain and whining like a bitch (excuse my language) just because she did/is.
I can't make a status on facebook expressing any kind of emotion over the baby without her telling me it's going to go downhill fast. Seriously close to telling her to stick her head where the sun don't shine.
*edit* sorry for the rant, she's been bugging me for a while and I needed to vent.
I know how you feel and hopefully once she has her baby she's too busy to bother and lets you enjoy your pregnancy.