I gave my boyfriend oral sex washed my mouth out with water and mouthwash and the next day i masturbated with saliva , is there a chance that i can become pregnant?

Pregnancy is not possible in above circumstances. Contraception remains otherwise key in avoiding undesired pregnancy and associated anxiety, specifically when intercourse becomes possible.

No worries.

Sperm dies outside the vagina and on surfaces in 3-5 minutes. In the oral cavity the acidity of the saliva kills the sperm, the water and mouthwash also.