What's wrong with me?

Hey Ladies,
​I have been trying to get pregnant. 
​I have a 3 year old and had a mc January 2013. 
​December 23-27,2013 started period right after me and my husband got to work. Then out of nowhere January 7-12, 2014 I started period again. So we started getting back to work again. Then durning intercourse January 26, 2013 I started bleeding again. I NEVER had this happen to me...we started once again but I need some help? What do you ladies think could be happening to me? Why can't I get pregnant?