both fresh cycles ended up as chemicals (see you had some of those, too). First donor we did 2 FETs; both plain neg. 2nd donor first FET transferred 3, and got our little boy! Added Lovenox on the successful FET cycle; 'can't hurt, might help"...
We still don't know what the problem was; I'm thinking really bad luck w/ implantation/bad embryos as I haven't been diagnosed w any uterine issues etc.
My advice to you is not to give up! We just kept going, and here we are w our precious boy!
All the best,