A.A.
I was diagnosed with hashimoto's thyroiditis when i was a couple weeks pregnant. My thyroid shut down more and more as the pregnancy progressed, now my little guy is 4 months and my thyroid is becoming more active. I'm taking synthroid while nursing (with OB and endocrinologist's approval) and my labs get checked every 1-2 months. Last month my TSH was untraceable and my T4 was super high. We lowered my dosage and I get it tested again in a few weeks. If it's not PP thyroiditis, then you will get used to your body and know when something is up. It's a hassle, but frequent testing and monitoring should make nursing safe whether you have too much or too little!