Hi sciencepassion,
I'm sorry for your loss. Unfortunately, we hear this far too often with thal minors. The medical profession does not want to acknowledge this, but even though thal minor may cause no problem to many carriers, there is a large group who do have miscarriages and often several. I believe the main problem lies in a reduction of the blood flow between the placenta and uterus and that thal minor can contribute to a condition known as the hypercoagulable state, a state that causes a drop in this blood flow, causing the placenta to detach from the uterus. This is well known about thal major and intermedia and from the amount of reported miscarriages, it seems very likely the cause in thal minor also.
Has your partner also been tested to make sure he is not a carrier? This is essential to make sure you can't have a thal major. There are somewhere around 300-400 million carriers on earth, so it is much more common than realized.
Folic acid should be taken when you are trying to get pregnant. Don't wait until you are pregnant, as it has been proven that folic acid helps to prevent birth defects when taken before getting pregnant. Also, I usually do suggest folic acid to minors in general because it helps to build red blood cells. I would recommend 2 mg daily. I also suggest 400 IU natural vitamin E daily. E is a mild blood thinner, which can help to prevent clotting issues. It is also a good antioxidant which can also help to counter the reasons for the clotting issue in the first place. When you do get pregnant, talk to your doctor about monitoring the pregnancy for any sign of the hypercoagulable state or thrombosis. If the doctor suspects this, he may prescribe one baby aspirin daily during the pregnancy for its blood thinning property.
Thal minors have children all the time. Even many majors have children. It is important to keep a good nutritious diet and avoid junk food. You can take a multivitamin but you should supplement folic acid and vitamin E in addition. Narendra has compiled a list of links to threads about this topic. You an see this at
http://www.thalassemiapatientsandfriends.com/index.php/topic,3041.msg30075.html#msg30075Check them out and see what experience other women have had. I think women can have a positive effect by taking these easy steps of diet and supplement. Miscarriage is a risk for some women, but I know women who have had multiple miscarriages but also have multiple kids.