Hi there
I don't know much about the antibodies - but I do have Hypothyroidism - what I have done so far is have my levels monitored every 6 weeks and meds adjusted accordingly - from what I understand as long as your levels are good there is little risk to the child - and in all honesty I'd much prefer to keep that head space
My levels have so far (knock on wood) been great - I have had to increase my meds once so far and last week they have been increased again only because as you move towards the finish line your thyroid goes into overdrive and my Endo is of the understanding that we should just help it along.
I asked him about any risks or concerns that I should have and he has assured me as long as the levels are all good there will be no additional risks posed to the baby.
Good Luck - have a chat with your Endo I'm sure he/she will be able to explain it better