I’m hoping to come here without judgement..

I found out tonight that I’m pregnant..again. I have three children already. I’m on birth control so no this wasn’t suppose to happen at all. I was religious with taking it. I know I should be happy, but I’m not. I’ve been crying non stop since that second line popped. See awhile back I told my doctor that I didn’t think my birth control was working properly. I told her I felt that my body was still ovulating. She pushed it to the side and said all was normal. I trusted her. And it failed me. My husband will not be happy about this at all. I’m scared to tell him. He keeps asking me what’s wrong, but I can’t find the words to tell him. I’m a mess. I never keep things from my husband, ever. What am I suppose to do? I’m so afraid of what will happen.