Hello dear,I understand your concern.In my opinion the spotting in pregnancy can be due to various causes pike thyroid abnormalities,progesterone insufficiency,abnormal pregnancy ,bleeding from cervix etc.The cervix becomes soft and vascular in pregnancy so it might bleed due to intercourse.So usually we advise to avoid intercourse during the first 3 months.As you had previous miscarriage I suggest you to consult doctor and get the necessary investigations like ultrasound,thyroid profile done to know the pregnancy status and rule out thyroid abnormalities.Avoid physical strain and intercourse.Avoid stress.Take healthy nutritional diet and folic acid supplements. Best regards...Dr.Srilatha