Went to the Drs last week seen my one twin vanished. Baby measured 6weeks, went back today to hear heart beat because last time they said they saw the flutter they seen the cardiovascular working. Today empty sac nothing in it went to a imaging center same empty sac. I’m suppose to be 7weeks1day now. No cramping no bleeding no nothing. Drs are confused as too what’s going on, saying possible miscarriage but they just saw the baby so their confused. This happen to anyone?