i am sorry to hear about your situation but am ver familiar with what you are experiencing.
I am currently in the exact same situation as you - though i am yet to have my first u/s (tomorrow morning) and get my bloodwork back. i have no previous children and am well and truly over losing babies and would really be interested in finding out what can be done to prevent this again. i am trying to think positive but since this is the 3rd time and you do take so much care what else can you do?
I noticed this was posted in Feb this year, i am really interested in how you got on and if there is anything that can be done to prevent this next time as i don't know how many more D & C's and miscarriages that i can take physically & mentally