this is normal, don't worry, 4X6 is fresh anyway and will be dried after roofed-in. the floor is built with OSB, water will not seep into OSB, which will retain its integrity even after submerged with water for a year. millions of houses have been framed when it rains, especially in south, it takes a week to frame a house, three days to roof in, there are good chance house will be soaked with water before roof is put in.