first of all big hugs and i am sorry that you have had yet another loss.
when you go back to your doctore ask for a copy of your resultls that way you can google it or ask on here what testing has been done.
when i had testing they tested to see if i had lupus, thyroid problems, diabetes, cholesterol, folate, iron, white blood cells you name it they did it i stopped counting the vials at number 32! turns out i have a thyroid that likes to do its own thing (never the same when i get tested every 3 months) i am also missing a folate gene, i am not creating the bad by product associated with this but they think this is why i m/c my body is rejecting unhealthy bubs.
(enough about me)
be forcefull when you go to DR next. how far along were you? maybe it could be a case of an incompetent cervix. arm yourself with as much information as you can when you see the DR next and demand things. its your body you deserve answers.
Good luck i do hope you get an answer soon.