Could I be pregnant ?

Okay so I was giving my boyfriend a bj and when he finished he had cum all over his hands , i gave him a towel and he wiped it off and I went to the bathroom . That was probably 2 minutes . After that he went to finger me and stuck his finger in , right when he got his finger halfway in a stopped him and I told him there could possibly be cum on his finger still . He said he was positive his finger was dry but what if there was a chance there was still some on his finger or something . I’m really paranoid and please be nice I am educated but I still do have anxiety and overthink .