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How can I determine who the father is without DNA testing

My LMP was the second week of mar or 3rd. I had sex with guy a the last week of Feb and guy b through out mar before and after my LMP I missed my period in april. My due date based on LMP is DEC 18 but based on my ultrasound is DEC 14. Who's most likely the father guy a or b? I think its guy b but I dont know cause I'm still worried is guy a.
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replied November 4th, 2015
Community Volunteer
Your due dates indicates that sex in the last part of March got you pregnant. So Guy B. You also had your period after Guy A, so that would indicate that you were not pregnant then.

Take care!
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replied November 4th, 2015
Extremely eHealthy
Agreed on guy B. You had a normal period after guy A which rules him out. Your likely ovulation date for this pregnancy was Mar 23, a couple of weeks after the start of your March menses.
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