How would you respond/feel?

So...I was discussing having another baby in a year or so, with my bf, and the topic of miscarriage came up. I had one before I met him and know that the possibility of another is there. Well, he told me that he wouldn't want to know if I had a miscarriage😓 So, when the time comes, am I not supposed to tell him I'm pregnant till I pass that "safety period" of 12w or do I just let him think I never lost it if I do. I just don't know how to even feel about his response. Advice and support needed, no negativity please. And thanks in advance for the help ladies❤️