Welcome to Healthcare Magic I think your Doctot has suspected some abnormality ion your pregnancy to order these tests. Have you done an ultrasound. Are you experiencing any problems like excessive weight gain, sweating tremors.. Your Haemoglobin is low. Kindly eat food rich in iron like fresh green leafy vegetables and nuts. B-hCG is highest by 11 weeks and then gradually reducec as pregnancy progresses normally. According to ultrasound more can be told as this information is insufficient. Kindly speak to your Doctor regarding the indication and problems if associated.