41 and trying for my fourth?

I have two teenagers and one almost 10 year old. I have been divorced and remarried and my husband and I decided we want to have a child together. Am I crazy? I’m afraid to even tell family or friends. I was extremely lucky with my first three and got pregnant the first month with each of them. But I was much younger. I’m so worried about my age and TTC this time. We just decided (after discussing it for over three years) that now is the right time so this will be my first month. Expect to ovulate on Christmas. Thoughts? Guess I just need to hear some positive vibes that it’s not selfish or crazy! ❤️ I thought I was done having kids and especially with my older two being the ages they are. But now I have baby fever and so badly want a child with my husband. I love my other three so much. Sorry for the long post!