Looking for guidance

Feeling really down. We've been trying since last summer for our second, and we're only going to try until this spring when I turn 42. Looks like AF is on the way again this month now, so we will only have 1-2 more tries. Feeling like it's not going to happen. I am so blessed with my 7 year old daughter, but felt something else was missing.

I am trying not to blame husband, but I wonder if we would have been in this situation if we had tried a few years ago when I wanted to. He just came around to wanting another this summer. And it seems like it might be too late.

And I keep hearing news about people hurting or killing their kids- just doesn't make sense. And there's all of us in here, trying and trying with no luck.

What do you do to keep yourself positive and going? How do I come to terms with it probably not happening and get myself to move on?