If you had a "normal" period in early November, like all your others, then it is unlikely you were pregnant then.
The ultrasound date is ONLY an approximation and usually based partly upon your LMP. If you conceived around November 3-7, you would have had your period start late in October, around October 23. You don't ovulate until 11-16 days into your cycle. Day 1 is when your period starts.
When exactly were your periods?
Hope it helps.