I'll add my voice to the chorus. Best of luck and I hope your physician can isolate the trouble. I have great hope that God knows what he's doing. Some days I just wish he'd put me in the loop about why he does it that way.
Good luck my friend. My wife was 'very high risk' for miscarriage too, it's so scary and terrifying, never knowing what the next day may bring. I know where your at bud.
Keep the faith and the good Lord will do what is best. Prayers are in bound. I had a little girl who died the same day I had her now that is really rough I can tell you. Hang in there.