First of all I'm sending you a Its tough gig this TTC business for some of us..
We don't all just become pregnant at the drop of a hat unfortunately.
I also find it VERY rude and get a bit upset by the comments at times too..For instance my own Step Father made the biggest mistake of his life by telling me I was cruel for not giving my DS a sibling..The look on my face must have been enough without me responding verbally and he did have the balls to call me up a couple of hours later to appolagise but still that hurt me in a really big way..He knows about my 6 precious little angels and he just didn't think and TBH I think that is what happens to most of those who do ask these type of questions.