Areyou being monitored by an endocrinologist? My OB said he could monitor me, but I already am established with an endo and felt more comfortable to have Her do it. Also the recommended guidelines for monitorIng your thyroid ofter very depending on what specialty of the Dr. For example my OB says that it is recommended for OBs to check bloodwork once per trimester, where my endocrinologist wants to test more frequently.
I had RAI due to Graves' disease and am on 137mcg daily, with an extra pill 1 day a week. So I have a slightly different situation. My reference range on my blood work shows a 2nd tri pregnancy range of 0.55-2.73. I've been fairly easy to regulate so they have not had to increase my dose at all beyond 1st tri. I do get bloodwork every 6-8 weeks for monitoring.
I wouldn't worry about the increased dosage, I think it's safer for pregnant women to be slightly hyper, rather than be hypo. So as long as they recheck you in a couple weeks to make sure you're not going too hyper you'll be fine.
And try not to google effects as most of what you'll find are worst case scenarios. Most of the time there isn't an ill effect if your levels fluctuate temporarily. My endo explained to me that the baby gets they're hormone first, which then makes you end up hypo, so there's probably more of an effect on you than the baby.