If my boyfriend ejaculated in my mouth and i put it in my vagina with saliva will i still get pregnant?

Sperm are created with limited energy stores the sustain them in the body temperature vaginal mucus for a few days, enough to conceive naturally. Exposing them to the enzymes and odd makeup of saliva will start killing them immediately. The chance of pregnancy in the cited event are not zero but close.

If you do not want to get pregnant, and this happened less than 72 hours ago, take Plan B. Your behavior is putting you at risk of pregnancy and STDs. Get HPV vaccine. Wish you good health! Safe sex: https://www.hopkinsmedicine.org/health/wellness-and-prevention/safer-sex-guidelines

If within 10 minutes of ejaculation then yes- there is a small chance of getting pregnant as the sperms would still be alive