I had a miscarriage a few years ago, the only time I've ever been pregnant.
Currently am single in my forties.
I'm coming to terms with the very painful reality that I'll probably never have kids.
And I am getting so fed up of people asking me why I don't have children and whether I regret it. I force myself to be polite and answer honestly. And then an given the obligatory advice of "have you thought about sperm donors, freezing your eggs" etc. Oh yeah, cos I've got to my forties unwillingly childless and have never thought to consider other possibilities. 
I never bring up the subject or ask for advice and am uncomfortable about discussing this very personal matter.
I know I'm probably BU but sometimes I'm filled with an almost uncontrollable urge to tell them to fuck the fuck off and mind their own goddam business.