Trying to conceive!

So I'm new to this app but I'm just really feeling down and guess I'm curious to know if any of you have any tips or anything that could possibly help with my situation! Okay so long story short I had my first child at the age of 16 he's a beautiful little boy who is my world and he's perfectly healthy always has been! I had some issues while giving birth and after I now suffer from endometriosis and also cervical cancer which I have surgery to have removed every three months I've also had promblems with cysts although I've been checked and now everything was supposed to be fine! Me and my fiancé have been together since my son was three months old and he's the love of my life!! We have been trying to conceive for little over a year now it's very frustrating and stressful especially when I see all my friends and family having no promblems in having there second or third child! I've had all the apps I take prenantal vitamins and we have sex regularly I just I'm starting to feel very discouraged and down so does anyone know of anything I could do or try without or before we decide to visit a fertility doctor?