How Am I Susposed To Tell Him

I have a problem, but a blessing just the same. I'm supposed to be his fiance' But if I tell him I'll no longer hold his name After he finds out that I'm carrying someone elses baby. I told him I wasn't pregnant We both knew of the possibility, but we thought, "no big deal". But that's because the symptoms weren't relevant. But I had no idea. So how am I supposed to tell him? I have to, to trick him wouldn't be right. But when he finds out I'm pregnant he'll probably kick me out of his life. I'm scared to see his reaction This pregnancy thing was an accident. But I love him and he loves me. How am I supposed to tell him at this state? He'll understand, hopefully! I'm kinda, sorta, 3 months too late!