TTC after miscarriage..

Back in November, I miscarried just 11 hours after I found out I was pregnant. We weren't trying at this point, nor was I expecting to get pregnant. 
My SO has since decided that he doesn't want to try for a baby for at least another three years and I don't think I can wait that long, since having a baby is all I really want in life. He has his reasons for saying this, because I have just come out of huge depression but I still feel that something is missing in my life. I've tried countless times to speak to him about it but he's dead set that we are doing things "his way". This is killing me inside! Also have hypothyroidism and POSSIBLE PCOS & Endo. Please help :(