I just found this and thought I'd share. It really sounds like I could have written this myself, after experiencing both a 1st trimester m/c and a chem pg. It just made me feel more normal to hear that someone else thinks about it exactly the same way I do. :)
The 12-Week Wait
ETA: A good article about anxiety during pregnancy after previous loss.
Easing the Anxiety of Pregnancy After Miscarriage