defensive

I had my first lets say interesting experience since announcing we were adopting.  I had to call the kids doc to arrange for them all to get physicals.  The nurse i was speaking to asked "just how many kids were we adopting".  Not rudely exactly, but not all that nice either.  I said, "just one", and then thought, why am i qualifing this?  So i joked "only 6"  :)  And she said, so that makes....to which i replied, 2 boys and 2 girls.  But really, why does it matter?  If i want to bring home 6 kids and feel capable, well then thats ok too right?  I think it just rubbed me the wrong way.  Doesn't matter in the long run, just something i've been ruminating on since it happened.  I know i need to move on and of course i will, just i've been stuck on it for some reason...