So frustrated

Yesterday I cried my eyes out...AF showed it’s ugly face and I just don’t get it...yes,

I’m 38, but I’m healthy, I don’t have PCOS, or endo, or anything, my tubes are working fine, I had just one small cyst removed on December, I have regular periods, my husband’s sperm is fine, we tried clomid, trigger shots, timed intercourse under medical supervision, and nothing. WHY? Why is it so hard? What am I doing wrong?