###Human: My hCG doubled in 72 hours. Does it mean I will miscarry? ###Assistant: Hi. I could understand your concern. It seems you had a bit irregular periods as well. Now sac is there but no fetal pole or yolk sac around 5+ weeks. Beta hCG that shows a progression of pregnancy increasing more than 50 % as you described. This scenario is known as anembryonic pregnancy means no embryo development. It is better to wait for a week or 10 days. Here, you have not mentioned the exact measure of the gestational sac. In case of irregular periods or some other factors dates discrepancy also occurs but still point is that still no yolk sac or fetal pole as you said, then more chances could be suspected like missed miscarriage or anembryonic pregnancy, if still in coming days fetal pole could not be seen. You can prepare yourself to be positive whatever has been written for you as you could have a healthy conception again. In case of an abnormal product of conception normally miscarriage happens so do not be sad. Just wait and see and have rescanned after 7 to 10 days to reach any definite conclusion. In case of bleeding, cramps, abdominal pain immediately report to tertiary care gynecology emergency unit. Irregular periods or abnormal product of conception. Wait and have a transvaginal scan after 7 to 10 days with expertise hands. Anembryonic pregnancy or suspected missed miscarriage. Suspected missed miscarriage. Follow scan report to have a final conclusion for proper further intervention. In case of bleeding or pain immediately rush to a gynecologist or early pregnancy unit emergency.