It has been so long I can't remember the actual measurements but it always measured thin. My dr was so focused on it and the meds he was giving me was messing my cycle up and keeping the follicles from developing that I finally told him I didn't want to worry about it anymore and just move forward like it is. My first son was conceived with a thin endo lining, so I didn't understand what all the fuss was over. To me it was almost like a new fad all the Drs were focusing on. But I wasn't doing IVF. IUI is much cheaper and a lot easier. With IVF I'm sure they want the best possible chances u can get. I'm sorry the first one didn't work out. Hopefully the next will. I know it is heart breaking. Just keep believing that it will happen and expect nothing less than a miracle.