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depending on these dates, conception took place around 14th of December (plus/minus 1 week). So you can be sure that guy B ist the father in your case.
Dr. N. Scheufele
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due date around 5th of Sept. means conception around 14th of Dec. Later ultrasounds are not reliable because growth develops individually different.
Yes, but maesuring refers to conception date, not to implantation.
You can be sure that based on your due dates conception took place around 14th of Dec. This is reliable for plus/minus 1 week. So intercourse before 7th of Dec. doesn´t count.