Childless young widow

It’s been 3 years since his passing. Ironically, he wanted kids and I told him I wanted to wait until I was more established in my career. He kept insisting and insisting, but I said no. I put my career first, how incredibly stupid of me. I thought time would be in our favor but I should have know that anything could happen, especially because his job was dangerous. I desperately wish we would have had children. I do not want to be childless forever, I’m 28, but I also cannot imagine having someone else’s children. Are there any young childless widows who wish you had children? How do you get through it? It seems like every month someone I know is making a pregnancy announcement, and I’m happy for them but I’m also very sad…