Hi, I have a question that non on the doctors couldn t answer me. It s been 3 years that me and my boyfriend been together, we have sex with out condom most of the time. I am an O+ blood type and I m not sure about my boyfriend.This is my question, Why can t I get pregnant? When ever I have feel that I m pregnant it happen to mis-cared, like bleed 40days, and a large clot and some red blood, Why? Please if u know the answer to my question answer me ASAP. I was 15 When I had my first Boyfriend and Now I m 18 turning 19 years old in April 17. It been like 4 years I can t get pregnant. Thank you