How can doctors tell if you are having identical twins from an ultrasound?
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In an early ultrasound they can probably tell from the yolk sac. The main sac looks like a cavity in the ultrasound. If there is one sac with two embryos it could be identical twins. There is only one yolk for identical twins because there was only one egg. Not sure of this is reliable but it is an example the kinds of images they get and the clues they go by.
Someone I know had an ivf implantation of one egg and had twins so obviously they were from one egg when the ultrasound showed two.
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