Reason for 2nd Trimester loss..

🌼Sara🌼
Anyone experience a 2nd trimester pregnancy loss and found out the reason why? I found out my baby no longer had a heart beat at 18w. My doctors are at a loss as to what happened. Still waiting on pathology report but been told to not get my hopes up on an answer. I am consumed with wondering what happened. I have so any questions that no one can answer 😔