I don't know if 3 would be considered a coincidence, maybe they will refer you back ?
I was having Miscarriages every pregnancy, and then they discovered I have inherited a blood disorder from my Dad.
He didn't know he has it, so of course I didn't.
It is usually only picked up because of recurrent miscarriages, or Pulmonary embolisms.
Now that I am on the medication, this pregnancy has made it to 16 weeks.
Praying they find a reason for you, as it is not fair at all :(