Boyfriend cheated on me with an escort

Hey everyone 25(f) here! My boyfriend had an encounter with a female escort unprotected Vaginal and oral sex twice that night on June 15 and 30 days later he tested negative from a fourth generation combo test. I’m really worried about me catching hiv a couple days later we had sex and he nutted inside me. Should I be really worried after we both test negative 30 days after. ??