I wish i would have know this about 20 years ago. I am blood type O and have just found out at the age of 42 that I am post menopausal already. my fsh level is 105.5. i have had 3 miscarriages and 3 chemical pregnancies. i am in good health and weight. at least now i have some type of answer as to why i have no children. did not start trying to conceive until the age of 38.