How far apart can you have unprotected sex and know for sure who is the father is

Patient : I had sex on December 25 around 10pm without a condom with my ex, he pulled out before ejaculation but I know there is a chance that pre-cum can get you pregnant. but I also had sex with my now boyfriend on dec 31and jan 1 who did ejaculate in me so I wanted to know if I was pregnant are the dates to close to determine who the father could be?
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