Not sure if it's any help, but good ol' Wiki says:

Hypothyroidism can result from postpartum thyroiditis, a condition that affects about 5% of all women within a year after giving birth. The first phase is typically hyperthyroidism. Then, the thyroid either returns to normal or a woman develops hypothyroidism. Of those women who experience hypothyroidism associated with postpartum thyroiditis, one in five will develop permanent hypothyroidism requiring life-long treatment.
So apparently after giving birth you might have hyperthyroidism that turns into hypothyroidism, which you already know you have. Does that help? (Doesn't mean you're not still special though!)