So i gave my boyfriend a blow job and after 3 hours i fingered myself and used my saliva to lubricate and go in. is there a chance i can get pregnant?

No, not without ejaculation in your vagina. But obviously you are close to giving in to temptation and having intercourse. Do not rely on your partner to keep holding off! Please at least have condoms handy when you are together or -- by far the wisest plan -- get on proper birth control (pill, subcutaneous insert, IUD, etc). Many or most persons in your situation are pregnant within a year.

Sperm will usually not live outside of the vagina for any length of time. The chances of a viable pregnancy in this scenario are very small. If your period does not come on a regular schedule, you should do a pregnancy test. Good luck.