I would suggest you see some good doctor. Get all your tests done. Don’t take it to light and don’t risk your life. Your condition is medically termed as recurrent pregnancy loss. There are many reasons for this problem but they are mostly because of chromosomal or genetic abnormalities that can happen either in egg or sperm. I would suggest you try one more time under some experienced doctors advice and if that attempt does not work for you, you can look for other options like IVF or surrogacy.