Hello dear I understand your concern Your delayed period could be due to Hypothyroidism: as it cause hormonal imbalance Pregnancy; as you had mild bleeding.. could be a implementation bleeding. I would suggest to consult gynecologist and undergo urine pregnancy test and or blood HCG test to confirm pregnancy. If above tests will come negative then no chance of pregnancy. In absence of pregnancy contact endocrinologist and undergo thyroid hormone analysis to confirm hypothyroidism and take proper treatment for thyroid dysfunction. Avoid stress, take healthy diet, drink plenty of water, do regular exercise, maintain proper pelvic hygiene. Hope this helps you Best regards Dr. Sagar