My last period started 10/26/12 and lasted about 4 days. For about a week I have been having random heartburn, very mild but still there, which I only ever got while I was pregnant with my daughter for the first 10 weeks. I have also been a lot more tired than usual, kind of irritable, and my breasts have been tender but not sore. I am wondering if it is possible that I ovulated early and am pregnant, and if so how likely it is? I don't think I am but I NEVER get heartburn no matter what I eat except like I said when I was pregnant with my daughter. thanks in advance.