I have ultrasound September 21,2017 and the result...

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it isi difficult to determine who is father ,but we can determine your ovulatory day if 
your cycle is regular 
duration of your cycle as the cycles can be at least 21 days to 35 days maximum,this result in variation in the day of ovulation .
but you can subtract 14 from the expected next period ,this is the suspected day of ovulation .
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