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I had the opposite problem and my TSH was high as soon as I got pregnant. My Dr said it was very important to get on meds ASAP but that it would be very easy to control and it was. I would definitely go see your doctor and they should be able to balance it out.

So a high TSH number actually means your levels are low (ie. thyroid is working too hard). Ideally it should be between 1-2.5, so higher than 2.5 is considered "low". Its tested throughout pregnancy because you're now sharing your thyroid hormones with baby and levels can get off.

Its an easy fix, and I've never had any side effects from the meds, but its important for it to be in balance for pregnancy. What was your number? I'm sure if it was a big enough flag your doctor would've contacted you immediately.

@ChiCalGoBee: Your number means your Thyroid activity is high (but yes, number-wise low). I think its less to be concerned about than the other way around. You're just getting a bit too much of the hormone. I'm not sure what the treatment is though.

I had the same situation as you - my blood work came back pretty early on in my pregnancy with a really low TSH level, mine was .003.

I had to have extra blood drawn once every few weeks and meet with an endocrinologist a few times throughout my pregnancy as they monitored my levels. There was talk of putting me on medication but they never ended up doing it, just kept a close on on everything. I also got an extra ultrasound between 20 weeks and the end to make sure the baby was developing okay.

Overall I remember being really panicked about it, but as long as they keep monitoring it everything should be totally fine.

My levels went back to normal after a few months post-partum.

Good luck!