It is not compulsory, that if you had
oligohydramnios in your previous
pregnancy, that you will have the same in all future pregnancies.So,just relax.Severe
hypothyroidism is a cause for
miscarriage,but again a correctable cause and hence no need to worry.Take your thyroid tablets regularly.Keep a close watch on your thyroid levels.Take periodic scans to detect any abnormality early.Take lots of rest.If there is threatened abortion(in the form of bleeding) ,consult gynecologist and take harmones. Otherwise chill ,and take care of yourself and everything will be fine.