my hcg levels went fr 1300 to 1100 but now its been a week later and i took a home pregnancy test and its showing positive, the doc said a week ago i would start bleeding, but i havent, and i havent had any cramping so they wanna check my levels again ob said that they are almost 100% sure im gonna miscarriage but how cause its been a week an no bleeding an home kit pregnancy say positive i dont know can some one please help me.