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Hi Guest,
Don't go by the ultrasound dating. There is NO test that pinpoint exactly how old the fetus is or when you conceived. As with children, everyone develops and grows at different rates or times.
With an LMP of November 1, you would be unlikely to conceive on November 4. It would be to early in your cycle, day 3. You normally won't ovulate until between days 11 and 16 of your cycle and sperm only remains viable for about 5 days.
But, having sex with different partners around when you likely conceived always raises the possibility that it could have been either partner. I think it unlikely that it was the ex but if we're off on the LMP then it is possible.
A DNA test would be your best solution.
Good luck.
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