Hello dear, I understand your concern. In my opinion there are different causes for abortion like:- 1)Chromosomal anamolies. 2)Hormonal abnormalities like thyroid abnormalities,progesterone insufficiency,diabetes etc. 3)Infections like TORCH, CMV, malaria, genital tract infections etc. 4)Cevical incompetence where in there is short cervix. etc. As the miscarriage occurred after 3 rd trimester the cause might be mostly short cervix. But it is confirmed only after physical examination and necessary investigations. Don t worry once the cause is diagnosed and treated the chances of miscarriage decrease. And all the causes might not get repeated in further pregnancies. Planning the next pregnancy after a gap of 3 months after miscarriage is a good option so that body gets itself adjusted for further pregnancy and meanwhile the thyroid abnormalities ,genital tract infections, or any should be checked and treated accordingly. Start taking folic acid supplements one month before planning the pregnancy. So I suggest you to consult gynaecologist and follow the instructions. Nothing to worry. Avoid stress. Hope this helps. Best regards...Dr.Srilatha