Water intake

Hey ladies! This is my first pregnancy and I’m at 6 weeks, so I haven’t seen the doctor yet and probably won’t for another two weeks as I’ve been told 8 weeks is usually when they want to see you.

In the meantime I have a question about water, though. I usually drink a ton of water (no less than a gallon per day) but I’ve been so exhausted these last few days I’ve drank much less. I know staying hydrated is super important rn, but can anyone tell me how many ounces are necessary?

My lips are PAINFULLY dry, but I live in a very dry climate with VERY high winds so winter always dries out my skin/lips, which makes it kind of hard to gauge hydration.