 [ Symptoms ] she is due nov 20th she concieved feb 26th i had sex with her feb 5th but she said she had sex with 2 others mine  i had sex with a woman feb 5th and she tells me her doctor told her she conceived feb 26th she told me she had sex with 2 other men around the conception date should i be worried since i had sex with her 3 weeks before her conception date she also told me she had sex with 2 other men around that time i pulled out other wore a condom but the third came inside could i still be the father [ Disease ] the only guarantee to establishing paternity will be a paternity test with that said based on a due date of november 20th sex most likely occurred during the period february 22   february 27 your question was mine your sexual encounter of february 5th is out of the range for being the father