How do I tell him I’m pregnant

Did a pregnancy test yesterday and it came up positive . Me and my boyfriend haven’t really spoken about children , we’ve been using condoms whilst having sex but on the occasion he doesn’t. I don’t know how to tell him I’m pregnant as I’m apprehensive about what his reaction would be, I’ve only just turned 18 and we both live with his parents ?? I work part time and he’s currently going for job interviews after leaving his old job, we would obviously be able to provide for the baby and they would be bought up in a loving family. I just don’t know how to tell him and the family I’m pregnant?