She said what?! (coworker vent)

Ms H13

So this weekend I was at my part-time job and one of the ladies I don't see very often was there and had apparently just learned that we're having twins.  In front of all of my other coworkers she asked me "do twins run in your family, or did you have to get help?"  GRRRRRRRR  If I wanted you to know the intimate details of how I conceived, I would have already told you, you d-bag.

I replied 'well, I did get some help from DH' to which everyone giggled and then the subject was changed, but I wanted to punch her.  Anyone else get any super insensitive comments or have good replies for them?