TSH Level

Hi mommies, is there anyone there also suffering from high TSH Level? I was from the clinic just getting the results from the blood test and it states there I have "4.15" my OB said that it was high enough it could damage the brain development of my baby. I'm 6 weeks pregnant. Is there anyone can share there thoughts about TSH? I'm so worried. I'm a first time mom and I don't have any idea of being pregnant. I'm asking for your help, thank you ?