My TSH level is 13.8. Is it very high? . I'm trying to conceive. Would it affect me or the baby if I got pregnant (while taking thyroid)!

You need. To take brand name T4 replacement and make sure your blood levels are in the normal range for a period of time before attempting to conceive. If you levels are normal, and checked multiple times during your pregnancy because your needs can change during pregnancy, you and the fetus will not be at any higher risk than normal.