Renee,
I deeply sympathize. I am losing my 10 week pregnancy now. It has been a slow process but the doctor confirmed today that the baby isn't growing. My body has started a miscarriage, but it's a little slow/light, so the doc gave me some medicine to take in a few days if nothing more happens.
What I wanted to tell you, though, is that you shouldn't feel pressure about not having children much longer. You have PLENTY OF TIME. Really. Your eggs should be fine until you are around 35 and even then, your fertility will depend on your relative health, your heredity, and other factors.
The miscarriage is not your fault and most most likely not because you are too old.
The way I've been thinking about is that things just didn't zip up right (DNA-wise) this time.
Maybe I'm saying too much, but it's comforting to reach out to someone who's experiencing a terrible loss too.
Peace to you.