I have been annoyed by the constant advice people offer but the most annoying was my sister. I posted something on facebook about drinking my healthy shake that I have here and there (before becoming pregnant I used it for weight loss but it is not meant just for weight loss, it is VERY nutritious and I use it now for added nutrition, not as a meal replacement) and she went off on how I need to be getting enough nutrition blah blah blah. I first responded with something like "I understand the importance of nutrition, I don't use this as a meal replacement, just for added nutrition" but when she kept going, I made it clear that I had done all the proper research, I wasn't a teenager getting pregnant, I was on the verge of 29 years old and had waited my entire life to become pregnant and if she thinks I would jump into this without being fully prepared then she doesn't know me very well, etc. That shut her up. LOL.
I messaged her after and let her know that although she has only good intentions, people can come off as annoying to us pregnant women because most of them act as if we are stupid and don't know anything about what we are getting into. It was a particularly bad time where I was already quite annoyed by many other comments and she was just close enough to me that I could go off on her and not feel too bad. She now totally respects what I think and understand that I DO know what I am doing and don't need someone to tell me what to do every step of the way.
I think people just assume we are all stupid and need constant help. I don't know why this is the assumption. Out of my siblings I am the most level-headed and successful, I never had any problems in school or with acting out as a child. I have don't everything in my life right where they have gotten caught up in drugs and had LOTS of problems. My sister I was talking about has 2 children, one she had young during her drug days. BUT as soon as they are parents, they think they know it all and have to tell us how to act while pregnant and how to raise our children. It just doesn't make sense!
Ok sorry rambling. My point is, I say you be upfront with them and blunt, but I am not afraid of saying how I feel in real life, same as cristeen. No point in being mean to them, but be honest so they know they are being rude or leaving unneccessary information.