She appeared on my door with a child support papers claiming the kid is mine

CAN IT BE POSSIBLE. I HAD UNPROTECTED SEX THE SAME WEEK I MET A GIRL A FEW DAYS LATER SHE TOLD ME SHE WAS TWO WEEKS PREGNANT. I SAID HOW SO I HAVNT KNOWN YOU FOR TWO WEEKS SHE SAID THE DOCTOR SAID IT GOES OFF LAST PERIOD. SHE DISAPPEARED AND I NENVER HEARD FROM HER SINCE BECAUSE SHE WAS UPSET I TOLD HER TO HAVE AN ABORTION. FAST FOWARD THREE YEARS LATER SHE POPS BACK UP WITH CHILD SUPPORT PAPERS, I LOOK HER UP AND SOME PPL THINK I LOOK LIKE HIM SOME SAY NO NOW IM WORRIED WHAT IS THE CHANCES DO YOU THINK THAT IS POSSIBLE