Telling my boyfriend I´m trans

I come here asking for help. My boyfriend doesn´t know I´m trans, we´ve been dating for more than a month and he is in love with me. Our relationship is great and we have an amazing sex life, he is very loving, kind and funny, he makes me happy and I try to make him happy. We have unprotected sex so he has asked about birth control a few times and I always tell him that he has nothing to worry about regarding pregnancy, that it will never happen. I want to take our emotional intimacy to the next level so I want to tell him my past, he is progressive, pro LGBT and has LGBT friends. Any advice? I love him and I´m crying while I type this.