A viable heartbeat should be seen 4-6 weeks from the time of conception. But if one is not seen, it does not necessarily mean a nonviable pregnancy. However, if the heartbeat is absent on a repeat ultrasound, then there is concern.
From the report you are given, it sounds as if your doctor’s assessment is correct: the evidence points to an impending miscarriage because you have an absent yolk sack, an irregular gestational sac, as well as an absent heartbeat. If there is fetal demise, then you must seek medical attention immediately to prevent any adverse health conditions. Your obstetrician is best aware of your health and this pregnancy. However, if you are unsure of his/her advice, then you should seek a second opinion.
