I had a miscarriage at 19 - the reason was probably chromosonal abnormality w/the embryo.
That being said, m/c's can occur at any age but at 40 the odds go up because of egg quality; however, there are many women on this forum who've gotten pregnant w/diminished ovarian reserve so don't give up especially since you're trying to get pg by natural means. If it were by IVF, well, that would be a different story. Best of luck and I'm sorry about your m/c - jen
One pregnancy with a chromosonal abnormality doesn't at all mean they are all that way. There is story after story on here (myself included) of one or more miscarriages followed by a healthy one. Yes, at 40 our chances of getting a healthy egg diminish, however the fact that you got pregnant is a great sign. It took me awhile to get a healthy one, but here I am now 15 weeks with what is so far a healthy pregnancy. I am so sorry for your loss, but please don't let this miscarriage deter you. There is still healthy ones in there. By the way, curious, how do you know you have a diminished ovarian reserve? Were you tested for that? Good luck to you!