If my boyfriend were to get a vasectomy..is there any possible chance at all of me still getting pregnant?

If the procedure is done correctly, you cannot. (Provided he's the only one you sleep with!) However, sometimes errors are made. Vasectomy failure is seen in 1 in 200 to 400 patients. It is due mostly to technical errors such as removal of <1 cm of vas. When your boyfriend gets his vasectomy done, you will want to have post-vasectomy checks your boyfriend's semen to make sure.