Mama, this really needs a doctor's eye, please do see an endocrinologist soon, especially since your OB flagged it. Thyroid issues during pregnancy (or planning) can affect baby, so better don't delay. A lot of moms I know got second opinions kasi important talaga, and some went straight to endocrinologist, both are valid, honestly. The main thing is you need proper monitoring and a treatment plan from someone who specializes in thyroid, kasi ito ay hindi basta-basta. Marami ring factors na pwedeng i-check pa (like kung ano talaga ang cause, or kung may autoimmune component), kaya really dapat with a specialist. Sending you strength, mama, you're doing the right thing by getting it checked. Keep us posted kung comfortable ka!