 [ Symptoms ] i have sinus problems even when i get a cold my nose always remain dry [ Disease ] the only true method to determine who may be the father is by having a paternity test but if your friends remembers when she had sexual relations with these two men it is possible to make a pretty accurate determination of paternity within a 10 day period for example if the baby were to be born on october 18 2014 case #1 then the probable range of conception would have been january 21 2014  january 29 2014 if the baby was born on october 1 2014 case #2 then the probable range of conception would be january 4  january   january 12 2014 in case # 1 if sex occurred on january 23rd with man # 2 and on january 12th with man # 1 then man # 2 is the likely father in case # 2 if sex occurred on january 6th with man # 1 and on january 18th with man # 2 then man # 1 would be the likely father the doctor who confirmed your friend is pregnancy can provide an expected due date and also provide the probable date range for conception there are also computer programs available on the internet which can also make the determination all that is needed is the expected due date and the dates on which sex occurred with the two men