My sis went through a miscarriage before she had her baby. But in her successful pregnancy she was put on best rest throughout pregnancy. I would suggest you to take proper precaution & don't take any stress. Most important follow everything as suggested by your doctor.

You definitely need to take good care. You must be aware of the reasons of the previous miscarriages. You should definitely make sure any such conditions do not arise. A friend of had some problems due to which the egg was not able to implant properly to the uterus lining. Then she could have baby after doctor's help.

Try to keep yourself happy with positive thought and for this make sure you take help of your family & friends. This is a time when you definitely need emotional support. Your mental status could very much affect your baby. So, BE Happy and do not stress yourself physically.
Above all do as suggested by your doctor.

I am sure your doctor might have instructed all possible measures that you need to take. Be sure not to be careless at all. Take rest and have nutritious diet.
All The Best