Help- new to orchids - big wet brown spots on leaves
I am a total newbie to orchids. I bought my first one (a beautiful white Phal with plenty of flowers) on a sale in a market last Sunday and took it home. I then placed it in a corner not far from a window on the 5th floor (so plenty of light, but not a lot of direct sunlight, as it is usually overcast).
It has been only 2 days since she arrived and a few brown stains have become much more noticeable now. They are humid to the touch. One of the smallest leaves is completely bent over the pot, like if it was wet. The flowers look healthy and beautiful, and I have not done anything to her yet: no water, no food, no fertilizer, since she arrived (3 days ago). I am attaching a picture.
Those spots don't look too good to me. Could anyone help me to understand what might be going on and how to prevent more damage? Many many thanks in advance.