Second failed IVF transfer

So we just found out our second transfer did not stick. Our first transfer was fresh so I had hopes that perhaps I would be one of those people who’s body did better with a frozen transfer. We also transferred 2 this time around. No such luck. Our embryos are not tested due to my age-31. My doctor said he thinks there may be something going on with the uterus because the according to him, the quality is fine. He said we will be doing in depth testing in 2 weeks, once the meds wear off. Has anyone gone through this? It feels like it will never happen for me to be honest.