Baby's sex 16w VS 20w

I know a lot of people find out the sex anywhere from 15 weeks on.

I have read that 20 weeks is the best due to a boy not dropping until around that time.

My OB will do an US at 20 weeks where hopefully they can tell the sex. I REALLY want to find out while my step daughter is here and am not sure if she will be visiting while we have our 20 week appointment.

So to the point: Have any of you found out the sex at 16 weeks only to have it be wrong and found out it was the opposite sex at 20 weeks?

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