Can a person with an elevated factor 8 level have a successful pregnancy I have lost 4 babies and we never knew why until after I lost the last one.

Sure.....but..... It will take a lot of work and appointment with specialists to get you through the pregnancy successfully. You need to work with a maternal-fetal medicine specialist and a hematologist together and start with them about 6 months before you conceive to get your blood levels "just right" for pregnancy. Then do exactly what they recommend. It's small sacrifice to make for a year to get a lifetime!