After 3 consecutive missed miscarriages ob/gyn won't do any tests. i have had other children but don't agree with his 'bad luck' diagnosis.

See below: You could always ask for a second opinion fro another obstetrician if unhappy with the diagnosis. Good luck.

Re-evaluate: I think most doctors would consider a work-up after 3 consecutive miscarriages, even if you have had children previously. Something may have changed with your body. You want to make sure that there is nothing that needs to be done differently before attempting to get pregnant again.