I had two miscarriages in a row after my second child. The first I had at six weeks so we never even got to go to the doctor. The second I was 10 weeks and they saw two sacks but no babies...a few days later I started bleeding and I miscarried...I had a D&C, but most of everything was already expelled. I was 39 when that one happened.
They did bunches of tests on me and discovered through a blood test/genetic test...that I had PAI 1 gene mutation. It causes blood clots in the uterus and thus a miscarriage in most cases. Originally with the 10 week miscarriage they thought I had developed a mole. I had never even heard of such a thing, but when they tested the matter collected during the d&c...it turned out it wasn't...thank God. I would have had to wait a year to try again and then constantly be tested to see if it would reoccur.
Anyway, with this next pregnancy, my doctor started me on a blood thinner called Lovenox as soon as I knew I was pregnant. I give myself a shot once a day. I'm 32 weeeks pregnant with our first boy. I'm 40 years old and things are progressing well. The baby is big and healthy...determined by numerous ultrasounds to keep track of everything.
I had my first at 35, my second at 37 and now my third at 40. The first two I had with no problems. I don't know that your age is much of a factor when it comes to miscarriage...but the PAI 1 gene is supposed to be fairly common. My doctor said that after two miscarriages most doctors test for it standard practice.
So hope some of that helps.
Did they do a pregnancy test to see if you were still producing HCG at the right levels? That would determine if the baby was alive and growing...especially if your last period was when you say it was.