Don't know what I'm doing wrong :(

I have had 3 miscarriages, I did all the tests looking for answers, everything is ok so I can have a baby. But these last two months I have been trying hard, I'm checking my cervical mucus, my basal temperature, clearblue ovulation test and I don't get pregnant! I don't understand :'(. I'm praying God.
​I just wanted to share my thoughts and the way I feel. Let's keep on trying.