How do i respond to "was it planned"?

[welliwasntexpectingthat]

About to go public next week on third pregnancy. So far have just told parents and both sets asked either "was it planned" or said " i take it it wasn't planned". I'm fine with this from them but i know i'll get it from friends/colleagues etc and whilst i could say i'll tell you when it becomes your business, i dont want to so how can i close it down politely?

My DSIS had the best response that she used when she got pregnant (happy accident) " Well we have been at it like rabbits, so it was bound to happen!"

I had the pleasure of witnessing her say this to her uptight, overly involved MIL

I haven't rtft but I was asked THREE TIMES by people I worked with but wouldn't consider friends if I was happy about it. More asked in a round about way if we had planned it, but I was gobsmacked about being asked if I was happy. Like, what did they expect me to say 'no, but I'm Catholic so I just have to put up and shut up?'
Two was said in a not-thinking way so I didn't take offence but one was asked in such a way that I just stared at her and the entire office looked away in embarrassment. She has form for being really bad at this kind of thing though.

Also, both my GP and midwife asked in my initial appointments. My midwife also asked a question along the lines of if I had any concerns re domestic abuse so I thought it was fairly standard.

I've been asked if I was happy about it. Didn't bother me in the slightest! Pregnancy is not all joy. I just said I was a bit shocked and not too happy at first but once I got used to the idea was pretty delighted. What's the big secret? Lots and lots and lits of people are NOT happy initially with discovering they're pregnant. Doesn't mean they don't adore the child.

Of course it doesn't mean that the child is any less loved, but it's gobsmackingly rude thing to ask a relative stranger. If I wasn't happy about it I'd hardly have confided in her either.