When will my retainer lisp go away?

I just got my after braces top and bottom retainer today and i have a MASSIVE lisp. I really dont wa t to speak at all when i have it in. Its not the kind with the wire and the plate across my palate but rather the kind that are in the shape of and incase your teeth but dont cover your pallete. The problem is when i from an s or t my toungue hits the edge making it a th soind. I cant seem to find a place to put my toungue where it wont make this noise. Please tell my if and when it will go away. School starts in 3 weeks and i really want it to be gone by then.

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