I had given my boyfriend a ha****b & he had ejaculated then we took a rest of about 20-30 min so his penis had been dried up by then & I sucked him off for a few minutes ( I heard saliva can kill semen ) then we proceeded to have unprotected sex but he did not ejaculate in me , is it possible for his sperms to be alive and that i may be pregnant ? please reply i'm really worried