Is Folbee safe to use with prenatal vitamins during pregnancy?

I recently had a miscarriage. My doctor said that I had too thick of blood in my uterus and that I may have possibly not produced enough progesterone during my pregnancy. To remedy this he recommended taking Folbee, as well as a childrens aspirin daily, along with my regular prenatal vitamin (that contains 800 mcg of folic acid, 2.5 mg of vit. B6, and 8mcg of Vit B12). He wants us to to begin taking the Folbee/aspiring once we find out that we have concieved. I am just wondering if there is a possibility of overdose in respects to folic acid. I have another appointment with him on Tuesday in which I will ask him personally... But since I couldn't find the amounts of folic acid in Folbee myself, I would appreciate any information you have to offer.

 Thanks for your time,

Carrie From Omaha