Hi All. I've NC'd for this as DH's family are on here, & I'm mostly on the litter tray boards these days 
DC has just turned 2.
MIL has been asking repeatedly when (not if) we are going to have another. We don't have a good relationship, I try and limit time spent with her to family birthdays where everyone else shows up as well, but we have a load of those coming up and so I'd like advice on how to respond so that she stops asking.
It's relevant that it took a long time to conceive our first baby, who was stillborn (passed away from disabilities) in early 2019. Subsequently, it took a while to conceive DC, and I had a very stressful pregnancy. I suppose I feel like it's a loaded question from anybody - whilst DH and I would quite like another, I don't know if or when it will happen for us - we're just delighted and grateful to have DC - and I feel tearful and full of rage when she asks personal questions. One of the reasons I dislike her is because she repeatedly compares our loss to an early abortion she had in the 1980s, after she had DH and his sisters - she also strangely competitive and frequently boasts about how fertile she and her children are. I want to respond to her unemotionally and definitively. What can I say?