After 5 MCs I am pregnant again. Normally it takes me a long time to get pregnant, but after a MC in June, I decided this month to start taking 10,000 iu D3, high dose folic acid and baby asprin. I've have tons of testing and never been told that I have blood clotting issues, but began taking baby asprin as many women swear by it. Women with recurrent miscarriage are apparently very low in vitamin D, and D3 apparently makes a huge difference. My doctor also said that she would recommend high dose folic acid just in case.