The US dating scan is pretty accurate but not spot on. When you are measuring something so tiny it is easy to be half a mm to the left or right, changing the EDD.
If bub was concieved on the 30th of August your EDD would be 23rd of May. That is 40 weeks from the first day of your last period, which theoretically was on the 16th of August, 2 weeks prior to conception.
Am i making any sense??? lol
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