TSH 4.2

[Bille234]

Hi,

I have had hypothyroidism for a while and am taking L-thyroxine. I had two missed miscarriages before; prior to trying to conceive, I went to my GP to check my thyroid levels and to see if it was safe to conceive. He said yes, but my TSH levels were 4.5. I became pregnant and had my blood drawn at 9 weeks. I received a call from the hospital informing me that I needed to increase my dosage because the recommended TSH levels should be 2.3, and mine were 4.2. Why didn't my GP inform me of this earlier? Will this affect my pregnancy?

I'm scared because I don't want to have my first scan where they can't see the heartbeat.