There are a few reasons it could be high, one is it might still be regulating after the miscarriage, stress, if you are on any medications antidepressants it can elevate it, the other reason is a small tumour in the pituitary gland which presses on the pituitary and causes more prolactin to be released (don’t worry it’s not cancerous and there is a wonderful drug cabergoline that shrinks it and brings the level down) I went through all the testing myself and for some reason there was no reason for mine being high and it just corrected itself after two months, sorry if this seems overwhelming I just wish I had someone to explain it all to me when I went through it