Unexplained infertility ?

After 2 miscarriages, I saw a fertility specialist, completed tons of testing. No answers. Everything is coming back “normal”. A Dr today told me I need to practice mindfulness, and avoid stress. But now, I feel like I don’t have a true answer to why this is happening- which makes it harder to solve. I have a 2 yr old daughter .. and my pregnancy process was cake. I’m feeling broken. Hoping for a success story?? Anyone out there with unexplained infertility, have a success story for me?