I had 4 losses in a row also! Its just heartbreaking! I had to take progesterone, baby asprin, prenatals, extra vit.b6, extra vit.b12, and extra folic acid and that seemed to do the trick. I went off the progesterone after 13 weeks, but continued to take everything else until I gave birth. I would try taking all of these things with your next pregnancy. Some people also need shots of loenox or somthing, but I didn't wind up needing them.