Again... Why me? Slipping into a dark place

Kate
I give up.... I can't do this anymore....
3rd time in less than a year
August- miscarriage
December- blighted ovum
Scan today- blighted ovum again.....
Why?  What am I doing wrong?  What's wrong with me?! The only option I see is to just give up; we have our son and I'm happy with that....