Pregnant? heeelllppppp?

ok my bf & i were messing around...we were just making out, but then he got an erection, and then would like stuff his penis back into his pants a couple times...then awhile later he fingered me. could i be pregnant from that? he never ejaculated, and i never felt anything wet...and he never like caressed his penis...he just would stuff it back in his pants or adjust it. im just worried about the whole precum thing. could he have accidentally gotten it on his fingers or something? how long do sperm survive anyways when exposed to air? some people say an hour, some people say they die instantly...im just really confused. and for the record..he didnt adjust his penis, then right away fingered me. there was like a 5-10 time gap.