My last mestruation was on 02/09/2011, I had relations ...

My last month was on 02/09/2011 I had a relationship with my boyfriend on 9/11 to 16/09 so I bet him on 9/19/09 and on 22/09 I used a condom with both of us. I'm pregnant with 26 How can I tell the day I got pregnant?
Expert answer:

The highest probability is a pregnancy from days 11 to 16, but you can not rule out the other days as possible days for the occurrence of pregnancy.

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