Is there a way to ensure that the baby will be normal?

I conceive easily and have a history of normal pregnancies. I have had 4 miscarriages and conceive on the first attempt every time. I have given birth to 4 children so far and am now pregnant again. I am very nervous this time because of the miscarriages and also because I have had a normal pregnancy and birth before and the baby is born without any issues. What should I do to ensure that this pregnancy and childbirth go smoothly and without complications? I am 6 weeks pregnant and will have my first prenatal appointment in 2 weeks.