Congrats on your rainbow baby!!! I'm so excited for you! Best of luck with your new pregnancy!
On the other hand, I don't support mandatory testing for any of the prenatal tests. Most practices routinely test symptomatic and high-risk clients, and I don't think there's adequate research to demonstrate to recommend treatment for subclinical hypothyroidism at this point in time. With my history of miscarriage, I've had my thyroid tested (and the results came back normal), but I don't think all pregnant mothers should take this test unless more evidence shows that treatment improves maternal/fetal outcomes. I think just knowing you have a greater likelihood of poor outcome without having any evidence-based treatment fails to benefit most women and creates a lot of anxiety.