Even mild thyroid dysfunction is early pregnancy is increases the risk of miscarriage, stillbirth, low birth weight, and other serious complications. Please see your doctor as soon as possible for a thyroid hormone replacement prescription.
You should talk with your doctor about starting a thyroid replacement medication. Adequate thyroid hormones are essential the growth and development of a fetus.
Even though your FT3 and FT4 are "normal", they are way too low in their ranges to be adequate.