I want to be safe if I let my boyfriend finish inside!

Hey guys! I’ve been on BC for about 2 years now but I still don’t let my bf finish inside. I’ve been thinking about it and I mean I wouldn’t be opposed to it at all but I just want to see what the best form of BC is. I have an appointment with my gyno next week but was wondering what everyone thought? Anyone with the shot or implant have any info? Thanks!