Don't dwell on your last pregnancy and induce fear into this one. My mom had 8 miscarriages and I was her 9th pregnancy and my brother was her 10th. There's nothing you can do, but eat well, exercise mildly, BREATHE and trust that your body is doing everything it should be.
My girlfriend had trouble with a few miscarriages, so this last one, they gave her TONS of progesterone, etc to hold onto the baby. Sadly, the baby was born Trisomy 18 - a certain death sentence. I'm not saying it was the progesterone, but all of the other times, there was a genetic issue for why the baby was miscarried. This was is 1 month old and shouldn't have lived past the first week according to research. Our bodies handle things like they should.
BREATHE. TRUST. Maybe even keep a journal to get all of your emotions out.