So since my bf smoked weed this weekend and came inside me, is there a possibility of me getting pregnant.???

Yes: Although smoking marijuana has been linked to abnormal sperm motility, (movement) and morphology, (shape), you can still get pregnant. If you want to prevent pregnancy you need to use a reliable contraceptive.

Sure: One thing has nothing to do with a other. Do a pregnancy test in a week and if negative do one a week later. If you are pregnant you need to ask your OB what the effect of weed would have on the fetus. Good luck either way.