Welcome to YT , I am sure this will all work itself out , dont stress yourself out . Your new furbaby can feel your stress. Trying a new food might be a good start. I have a 16 week old and she had issues last week w/ the runs ( yikes ) took her to the vet and they said to try Purina EN which is a very mild soft food . Just for a few days until the stools are better. Keep us posted!