Hypothyrodism - Indianapolis,IN

You've repeated questions about thyroid levels, thyroid antibodies, hgc and progesterone being low, etc. Repeating questions a lot is kind of spammy.
Although there may be doctors on this site, they do not have access to your particular test results, health history or that of your husband.
If you've had 3 miscarriages, you might have an Rh factor thing going on if your husband has a different blood type than you. Your immune system would be involved, but there are ways to treat that now.
I really think you should be talking to an endocrinologist or a fertility specialist or if you are still dealing with grief from 3 prior miscarriages, some grief therapy might be in order. If you are currently pregnant and this worried, the worry is not good for your pregnancy.
No one here is going to be able to give you the answers that will really be able to help you. Please seek some professional help.

I'm hypothyroid and just delivered a healthy little girl on Synthroid the whole time. I asked my doctor about this before getting pregnant:

The Synthroid will not hurt the baby. The baby's thyroid function develops independently of yours, and it does not cross the placenta.
If anything, reducing your TSH OFF of what your healthy level is would jeopardize the baby's health. If your levels are off, the baby's are likely to develop in the same manner. (not sure how that works, but that's what she told me).
You'll need to be tested routinely through your pregnancy to make sure that your levels are healthy and adjusted.
if your concerned, google it. There's a ton of info out there about thyroid and pregnancy.

Actually the potential for your baby to be harmed is greater if your thyroid level was not in the correct range. There are potential negative impacts to baby if you go through a thryroid storm or have extreme out of norm ranges for any extended time. As long as your OB knows about your thyroid situation and your endocrinoloigst knows your pregnant you and baby will be just fine.

I have hypothyroid myself and my dosage had to be adjusted a few times during pregnancy. Then it gradually returned to normal after I gave birth. I delivered a perfectly healthy boy.

Your thyroid needs to be at a healthy level for him to develop correctly. Keep taking your medicine. You should be tested regularly throughout your pregnancy. I have hypothyroid myself and my dosage had to be adjusted a few times during pregnancy. Then it gradually returned to normal after I gave birth.