I would specifically ask what the spot can mean, and how often your doctor observes that type of spot and the baby is born normal. I would also take the sonogram results to another doctor to ask them also. One who is ok with recommending abortion in cases of genetic abnormalities. If you are the type of person who would want to abort if something is very wrong, then I think you should satisfy any questions you have. If you would never abort then no real need to pursue more consult I guess. I am not trying to alarm you, I have absolutely no idea what the dark spot means or doesn’t mean, but I think not worrying is probably impossible, and probably worrying enough to get more answers is worthwhile. I recommend asking the doctor their views on abortion before the appointment, because if you get a doctor who is fundamentally against abortion, I think you risk not being told the whole truth. I hate to say that, but we see pharmacists who don’t want to fill scripts for the pill, and Catholic hospitals will not do abortions, or tie tubes, and rape victims not being told about or given morning after pill in the ER. I believe it to be a minority of medical professionals, but some decide for the patient. Even if you would never abort, you want a doctor who is ok with the idea, to make sure you get all your answers in my opinion.
Have you had a 4D sonogram? Maybe that will show more information? I don’t know a lot about it, but it shows more detail, and definitely not all doctors have the machine.
Also, if there is some sort of defect you might need an expert in neonatal cardiology, or whatever specialty handles that?
Having said all that scary stuff, a regular ultrasound is fairly fuzzy, it could be a blip on the screen maybe?