Hypothyroid and miscarriage

I had a miscarriage a few months ago and since then they have been monitoring my thryroid. My levels are high, however my doctor is saying they are “sub-clinical” and wouldn’t require medication yet just to continue to monitor. Lately I have just felt off and have symptoms of a hypothyroid. My hair is very brittle, my joints feel sore and I have terrible night sweats. My husband and I started trying again and I am so afraid that if I get pregnant and there is something wrong with my thyroid that I will lose that baby too. Does anyone have any experience with this?