My fiancé wants to have an abortion

We've been together for five years, we have twin girls and a house together. We just got engaged two weeks ago with a ring and everything. Two days later she comes home and tells me she's pregnant again. She had an unstable home life as a kid and always told me how sexy it was to her that I never wanted kids. I told her too early on about it. So I didn't think it'd be a problem. She had a look on her face and didn't say anything. We made the appointment at the abortion clinic later that day with a bunch of silence.<br><br>She hasn't been back to work since she told me the news. The appointment is tomorrow and I'm not getting any sleep. I'm losing my mind with all the thoughts of reasons she wants an abortion. Does she hate our children? Does she hate our life together? Does she hate me? Was she always using me for a safe home? I just can't sleep and I'm so sad right now. I love her so much. I love our children so much. I just don't know what to do now.