<s>[INST] hi my husband has a blood group of O- and i am a B+ and i have recently had a missed miscarriage. is the difference in blood group what caused that? the doctor has also mentioned about the possibility of me having pcos. I have yet to get tested. i did not have any significant weight gain in the past 2 years, not pre-diabetic. i do not have periods that are irregular. could i be having pcos? [/INST] HelloThanks for your query.PCs is characterized by sonographically evident polycystic ovaries, irregular menstrual cycles and other features such as hirsutism, glucose intolerance etc. It is not compulsory to have irregular cycles to be diagnosed as PCs. Any 2 out of the 3 cluster of symptoms and signs I mentioned are enough to diagnose PCs. Also, a potential complication in pregnancy is if you are Rh negative and your partner is Rh positive. The groups you have would not result in a miscarriage. Common causes of abortions are genetic causes, autoimmune conditions, abnormalities in uterine shape and size, hormonal imbalance and intrauterine infections. Please have yourself evaluated by a high risk pregnancy specialist, and a Genetic counselor, before planning your next pregnancy. Take care. </s>