Hi Elton, since you mentioned you both are planning for a baby, it would be good to get the thyroid tested and start treatment. If thyroid issues are left untreated, it can definitely create problems in conceiving, and can also create health based issues during pregnancy. Hypothyroidism during pregnancy can cause developmental and neurological problems in the unborn baby, while hyperthyroidism can cause very high blood pressure and lead to preeclampsia, which is a dangerous health condition. The main precaution your wife should take is to first treat the condition, as it can otherwise be difficult to conceive, or have a healthy pregnancy. Please get in touch with a doctor and follow the medical advice as suggested. Wish you both all the best. here's an interesting article on thyroid and pregnancy http://natural-fertility-info.com/solve-thyroid-problems-before-conceiving-a-baby.html