Thanks for posting your query.
I understand your concern.
Your TSH level
is very low. TSH level does have an effect over menstruation
. You can go in for an urine pregnancy test to confirm pregnancy. I suggest you to visit your endocrinologist
to revise the dosage of your medication.
Hope I have answered your query. I will be available for your follow up queries, if any.
Wishing you a good health.