Telling my boyfriend 😳

So my period is twelve days late. My cycle is extremely irregular. I’ve been told by my obgyn its damn near impossible for me to have children. I have endo and recently stopped by birth control because of medications I’m taking and will eventually switch to the implant. But something feels different this time about not getting my period yet. I’m gonna go buy some pregnancy test tonight to confirm if I am or not. But I’m more terrified to tell my boyfriend than anything. We always discussed how we didn’t want children. So I honestly don’t know how he’ll take it. How should I handle this?