What are the likelihood...?
Answers: The chances the OB is wrong are at lowest 80%. But he is probably within a week of the right date. My first kid he be wrong by 2 days and the second kid he was bad by a full seven days. Of course I was behind time, not early (bummer). But the OB is usually not past its sell-by date more than a week, at most 2, provided you carry to permanent status.
The doctor initially gets your due date base on when you say your ultimate period be. But you can tell how far along someone is from an ultrasound also.
ably, babies don't always listen to ob/gyns. they similar to to come when they please, which may be sooner or later.
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