It is possible but very rare. I know because a friend of mine had sex with her husband. And the next day he went away on buiness. During the weekend he was gone she had sex with her lover. She found out she was pregnant six weeks later. During an ultrasound she was told she was having fraternal twins. When the girls were born her didn't believe that they were his so her ordered a DNA test and when the test came back it said one of the girls was his and the other was not. They ran the test two more times because they thought there had to be some kind of mistake. When they ran it it still came back that one girl wasn't his.
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