You definitely seem to have Hypothyroidism
and you are on the right medication. You need to continue taking the tablets, even after you conceive.
You can conceive within a month provided you have unprotected sexual intercourse on your days of fertile period.
However, do not hurry in getting pregnant. A 3 months of therapy with Thyronorm
is a good time for the thyroid status to improve and consequently conceive a healthy baby.
All the best!