Feeling completely defeated

My husband and I did IVF this winter with PGS testing and ended up with one healthy embryo. We were pretty bummed as we were hoping for more, but super excited nonetheless. The FET transfer was on Jan 31st and a few days later, I got my first BFP ever!!! I was completely over the moon. I figured that since we had PGS testing done on our embryos, our chances of miscarriage at this point were pretty low. Boy was I wrong 😞 We went in for our first ultrasound and 6.5 weeks and only saw an empty sac. A week later, we saw the same thing. Now I'm sitting here going through a miscarriage wondering what could have possibly gone wrong and wondering if there was anything we could have done. Does anyone have any similar stories?