easy dating method - Conception dating ultrasound
This is the reason that ultrasounds at this stage are so accurate.
All the babies grow at the same rate no matter what is going on with a few very specific exceptions.
Your low caloric intake was not enough to affect the babies growth at this stage.
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Also if there was an egg and it was fertilized, than the medication prevented there a such thing as a non-invasive prenatal paternity test? It says it "isolates fetal DNA from the mother's blood".