YANBU! My mother would do this, I'm the youngest, with a large age gap between my elder siblings. When she deemed them "too selfish" to give her grandchildren, she pinned all her hopes on me. I wasn't even in a relationship when it started, early 30s I suppose? She even said if I had a child "they would take care of it". I live over 300 miles away from her!
When I got married, she assumed that meant we would get on with having a family. DH and I didn't want children, and I made that clear to her, and that we were making sure I didn't get pregnant. She went so far as to say she hoped I'd accidentally get pregnant, and that I wouldn't terminate if I did!
When DH died unexpectedly (and very young), she said, "I bet you wish you'd listened to me and had a little child with him."
I could barely function, let alone take care of a baby in the state I was in.
If I'm honest, she made a bit of a dogs dinner of bringing up her own children, the sort of mother who loves babies, but dislikes it when the child begins to have their own thoughts and opinions. I doubt I'd have let any child of mine near her.
Sorry, rant over! But that did stir up some stuff. Why pressure somebody to have a child they're not even ttc?
Nip it in the bud now OP, you get to decide what you do with your body.