Rainbow baby help

So me and my S/O are trying to get pregnant. I've had a miscarriage before and I'm so scared that I won't get pregnant again. We've been trying for 6 months and nothing:( I'm taking vitamins eating healthy exercising and everything and nothing seems to be working. I see people getting pregnant on Facebook every day and it just knocks my confidence further. I just want a little baby of my own :( . Can anyone help?