I’ve been super thirsty..I drank a gallon of water . Is that too much

I’m 6 weeks and haven’t been drinking a lot of water lately bc everything even water has made me feel sick. Well this morning I drank coffee and now I’m craving water lol. I got a gallon jug and I’ve almost drank it all throughout the day (only a couple drinks left ) I then read that that could be harmful and is too much water? I’m only like 112 pounds idk if that matters