We had 3 miscarriages within 3 years of going off BC. They found a small amount of endometriosis and gave my wife some antibiotics. Endometriosis is supposedly from birth control use and causes miscarriages. That went away and the next pregnancy stuck. Not a definitive, helpful answer, but I’d encourage a test for endometriosis after going off BC, and using antibiotics to clear it if it exists Just a personal anecdote, and not a fix all.