Fetus 1 cm Cant see heart beat

I am soooo worried. I went for an ultrasound the other day and the lady said that there was a sac and the fetus is about 1 cm. she said that she couldnt find a heart beart or measure any fluids cause It was still to small. I also have a sist on my right overy. What is wrong or is everything ok. I have looked up alot online and haven't really found what I was looking for.  is it still early or is something wrong

[Dr. Kokil Mathur]

Hi!
What you have been diagnosed as is probably blighted ovum. An anembryonic gestation is characterized by a normal-appearing gestational sac, but the absence of an embryo. Normally a gestational sac with a yolk sac appears at about 5 weeks of pregnancy and can be well visualized by 6 weeks on a transvaginal ultrasound. A pregnancy is anembryonic or blighted ovum, if a transvaginal ultrasound reveals a sac with gestational sac diameter greater than 13 mm and no yolk sac, or diameter more than 18 mm with no embryo. Follow-up ultrasound is done after 10 days to verify diagnosis. Normally it is wise to wait until 10-11 weeks of pregnancy for a confirmed diagnosis of blighted ovum or fetal death. Meanwhile monitor the HCG levels.  Do discuss this with your gynecologist and get yourself examined. Take care!