It's not normal and very possibly a sign of autoimmune
thyroid disease. Your TPO titer may be positive as well.
Next Steps
Yes these antibodies do cause problems in pregnancy but the Good news is that your problem can be totally reversed, not by masking the symptoms but by addressing the root cause of your issue. To know more on this, please read my blogs on www.truhealing.com or practo health feeds. Hope that helps....