I missed my period and spotted around the time I was suppose to have my period. I been having lower back pain, headaches, heat flashes,cramps, and now I'm also just starting feeling like throwing up , moody , food cravings. I took a pregnancy test and they all came out negative and a blood test and the only thing abnormal is a high blood count . Doctor still thinks I'm pregnant so we got an ultrasound and saw nothing . Is there a chance I am?