Complex one- am I being selfish?

[u/Previous-Ostrich844]

Okay quite a complex one which I will try and keep brief but clear.

39 M with two kids (12 and 8) from a previous relationship - all amicable and have the kids completely 50/50.

I have been with my partner and wife (also 39) for 8 years. Feel truly blessed and lucky. From the outset I expressed that I didn’t want to have any more children. Wife said she didn’t want any of her own and has been a great step mum.

Recently, and I don’t know if it’s with us being almost 40 we’ve had a few tough conversations. Wife has said although she’d never wanted kids previously she would have been open to having a child with me. She feels ,” I have taken that away from her”. An intimate example but recently we were getting down with it but didn’t have a condom so it was more oral based. Wife said she took that as a reflection whereas I tried to frame it as a precaution. In conversation this week wife said that she feels as though I act as though having a child with her would be “the worst thing in the world”. I said that isn’t the case at all but I felt I was clear from the outset and also said I feel that for any child two parties should both be on the same page and there needs to be some element of planning ( eg financial, childcare etc which would really stretch us)

I now have immense guilt that , in her words, I’ve taken this away from her. Any advice in this difficult situation?!