I'm sorry OP. Whatever cold virus is going around seems particularly miserable this year. I agree that what you are doing is perfect. And SLEEP as much as you can. Hot fluids like chicken soup, your hot water and lemon, are very helpful. Try to stay hydrated as much as you can, which I know is hard with nausea, etc.
And gargling with warm/hot salt water can help with a cough, and definitely with a sore throat.
Keep an eye on fever for sure. I'd check that every 8 hours or so.
And congrats on your pregnancy!