Is There A Way To Know The Paternity Of The Baby With Information Like The Last Menstrual Period And Days When I Had Intercourse?

Hi I m 5weeks 5 days pregnant, my last period was on 18th may, I had intercourse from 29,30,31 with first guy , then on the 02 june had intercourse with someone different meaning on the 1st I didn t do anything , so if doing calculations who couldn t be the father.