Do contacts only go up to a certain prescription? or can it go as high as it needs to? because l have a pretty high prescription, and im wondering what is the limit for contact prescription, if there is one?

Do not worry contacts go up to any RX. You might not get a regualr soft contact. You might have to get hard contact or try the new syngereyes. These are soft and hard put togther.
The soft regular contacts go up to -10.00 and +10.00. It all depends on the RX, try speaking with your doctor and he will give you diffrent options. Remeber to always have an extra pair of glasses just in case

l have patients in lenses up to -20. So long as your eye can support the lens, there is no worry about the rx..