This made me laugh because thats EXACTLY how i am. This is my first pregnancy & everytime i feel something i just start to panic. Its' just how we are. I also go on the internet searching EVERYTHING. My advice to you would be after you have your first ultrasound & you hear the babies heartbeat just assure your wife that the chances of miscarriage are far less then before. Also tell her there will always be next time. There is nothing we can do to prevent a miscarriage except just trying to relax. Stressing & worrying will only make things worse. Good luck!!!!!! & congrats !
Buy her a fetal Doppler so she can hear baby's heartbeat whenever she wants. It will ease her mind. You can buy them on fetaldoppler.net :)