Hyperthyroidism

Has anyone been diagnosed with an over-active thyroid whilst pregnant? I have HG and because of severe vomiting, my thyroid is out of whack and showing high levels that indicate hyperthyroidism. Is this likely to go down? I have to repeat bloods to check my levels. They aren't sure if it's just the hyperemesis that has caused it or that I have an actual problem. I'm quite worried, as I googled (oops) and it sounds extremely scary, especially as I'm not on any thyroid medication right now. I'm 9 weeks.
If I do have hyperthyroidism, would this mean that my pregnancy will be classed as high risk and no longer able to use a Birthing Centre or have a home birth?

Thank you for reading