### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
I will be 7 weeks pregnant this Thursday. I had a vaginal ultrasound on Monday and the doctor did not see a heartbeat.  He told me to expect the worst but that he would do another ultrasound on Friday.   I have had mild spotting (mostly brown for about a week).  My hormone levels have been good so far, though he did want to see my ChatDoctor levels rise even higher (they were 4700 at about 6 weeks and my progesterone was 23).  He told me to do another bloodtest to see if the hormones are continuing to rise. This morning I woke up to heavy bleeding and passed some pretty large clots.  I was convinced that I miscarried.  The doctor called me today with results of the bloodtest I did yesterday.  He said that the hormone levels look good, but that does not necessarily mean that the embryo is developing normally.  Since I am RH negative, I am going in tomorrow for a Rhogham shot and the doctor may do another ultrasound to see if I have miscarried.  If the embryo is still there, is there a chance it is still too early to see the heartbeat?  I should add that last week he did see the gestational sac in the uterus, as well as afetal pole.

### output:

Hi, Thanks for the query.  Fetal heart sounds are seen by 7 weeks of pregnancy in USG scan. But as the date of conception/ ovulation time tend to differ from person to person, it's better to wait for a week & repeat the scan to confirm absent heart beats.  - heart beats are not seen when heart is not developed, but all other signs & hormonal set up is like pregnancy. The condition is called blighted or chemical pregnancy. This is usually expelled out / evacuated.  Anti D is taken after evacuation.  Thanks.