All I want is a bath 😩

I am 11+4 and I am sick with an awful cold that has just knocked me totally on my ass. I’ve avoided taking any medication but what I really really want is a bath, my whole body aches. I haven’t taken one since I’ve been pregnant because I’m worried I’m going to make the water too warm - sometimes I don’t think a bath or shower is very hot and then my husband will come in and make a big deal about how I only bathe in scalding hot water. Any tips on how to make sure 100% the water isn’t too hot? Anyway I can get away with not having just a lukewarm bath? I wish I had a thermometer in the house but I don’t.