Anyone going through what I'm going through I need a friend...

Hi I'm Hannie I'm 19 years old and I have a 1 year old baby girl. I've struggled with my health for a long time because of a severe auto immune disease causing my body to believe that healthy cells and tissues are actually dangrous so it fights it off meaning I have lungs that work to half the capacity they're supposed to, a liver and a stomach that are deteriorating and no hair :( I have recently recieved some absolutely devastating news...the doctors after many many tests have come to the conclusion that they are 80% sure I am going through early menopause and that this time next year I could lose my ability to have children my fiancé and I have decided to not waste that year and are TTC anyone got any tips that can help me fall pregnant as I am so so desperate to give my little girl a brother or sister!!!! Even if you haven't gone through any of this and wouldn't mind if I just chatted to you just for someone to talk to I would really appreciate it feeling very low at the moment!