Your sister was rude... its not the big "gotcha" she thinks it is.
Ive had SOOOO many people ask me point blank if Im pregnant yet that I have been avoiding texting friends, for fear they will ask me. Today one friend asked me in a group chat! Another friend from the same group chat texted me privately a couple of weeks ago, to ask!
Fortunately, if my family suspects anything, they havent mentioned it at all. My mom is the only one who knows, and shes been covering for me, with the not drinking. Though my brother seems to have twigged it, but hasnt mentioned it to me yet.
Everyone close to me knows I was trying for a baby via IVF (Im single), but its still too early to be telling the whole world, as I wouldnt want to tell them if it turned out to not progress.
I have my first scan on Thursday, and, all being well, I will start telling more people.