Hay, I totally get the worry, lalo na first time ka! A few of us mums have mentioned hearing sounds in our ears during pregnancy, sometimes it's just increased blood flow or pressure changes, pero since you have hyperthyroidism din, it's really better to mention this to your OB or endocrinologist kasi they need to know the full picture of what's happening with you. Pregnancy can be tricky with thyroid conditions, so don't hesitate to text or call your doctor even just for peace of mind, that's what they're there for, at honestly mas makakatulog ka ng mahimbing once you've asked na!