Hello, Firstly, I would like to know why you have been taking different doses of thyroxine. If this was advised by your consultant, it is fine. Otherwise, I would ask you to take the same dose everyday as required. The requirement of thyroxine supplement increases as pregnancy advances. The presence of yellowish discharge calls for local examination along with urinalysis and a vaginal swab. Any infection should be controlled immediately with necessary medication and genital hygiene maintained. A sonogram may also be needed to assess the status of the pregnancy. Hope this helps.