I am not sure of the precentages are but i do know from 1st hand experience it can happen. Just try to relax and i am sure everything will work out fine
my dr told me that once they heard the heart beat my risk of miscarriage would drop. Alot of people i know have had miscarriages with their first and then go on to have normal healthy pregnancys. Just try not to stress bc I hear you can also stress the baby. think positive! good luck to you :)
i have ben told that once you hit the 8th week chance of misscarriage drops to less then 5 percent, i also have had misscarriage in the past and had the same fears, im currently 15 wk preg wit twins and still fear the worst, i purchaced a doppler monitor on amazon to help curb my fears in between doc apt it has been a heaven sent, when you hear your babies heart beat it sooths you.