I worry too. A first-time mom after a miscarriage, every twinge, symptom, or lack of symptom, will start me imagining the worst.
I recently found a website where you can get an estimate of your chances of a miscarriage based on your LMP, and I've found in so comforting.
Today, in my 5th week, the chances are at 10%. That's still a lot of course, but in another two weeks, they'll be down to three. Every time I look at those numbers, I can feel my anxiety going down. Maybe not completely away, but down.
So for anyone else who thinks some statistics would give them a bit of calm, here it is. Hope it helps!
http://spacefem.com/pregnant/mc.php