Hi V. - Wow, you have been through a lot in recent years... good for you for not giving up and getting to the bottom of it. I wish you all the best with this pregnancy and hope for no complications. I don't think there is anything you can really do to prevent miscarriage in general, but where you have an identified blood clotting issue, you absolutely should take that medication if that is what is recommended. It sounds like your dr. and MGH in general aren't as proactive as you need or would like, and I see you live in Brighton, so I know it wouldn't be too far for you to deal with Mt. Auburn Hospital (by the way, there was a thread on here a week or two ago about peoples' experiences there and they were all extremely positive). I have had a few medical issues there, including my two kids' births, and I LOVE LOVE them. It is a smaller hospital so you definitely get MUCH more attention, and faster. My OB is out of Mt. Auburn Practice for Women on Mt. Auburn St. in Watertown. Her name is Leslie MacDonald, and there is another OB there and a NP who are both wonderful. It is a smaller, more intimate office and they definitely know you and take care of you. I had hypertension with both pregnancies and I always felt VERY cared for, looked out for, etc., from the nurses to the doctor to the secretary. I have no idea if they are taking new patients now but you never know... the office number is ###-###-####. Good luck and best wishes for a healthy pregnancy.