I Have Been Wearing my Expanders for 2 Weeks and Activated Them 14 Times(3.5mm)

Palatal expansion can enhance your Invisalign result and can be accomplished at any age with a removable appliance that pushes against the palatal bone,  is activated slowly (2 X a week), and has good stability.  However the most common type of expansion called Rapid Palatal Expansion (RPE) calls for a more rapid activation (daily),  has been shown to be more unstable, so if you had this type of expansion, plan on some relapse.  However, your orthodontist is giving you good information in that the aligners can be made to hold the expansion you have gained until more stability is achieved.  Wearing retainers at night indefinitely after finishing your Invisalign treatment will assure you the best result.

You are wise to ask these questions. At your age that rapid of expansion likely it only tooth tipping, which maybe all you need. If that is the case Invisalign will be able to maintain that with excellent compliance on your part.

You clearly chose your doctor because you trust his expertise. As long as he is a certified Invisalign provider and has many cases under his belt I am sure you are in good hands.

Chances are, your doctors has done this before. Expansion at your age will result in dental tipping, which usually will relapse quickly. However, if your doctor is able to move the teeth out a certain distance, your corrected bite may keep the result stable enough until your recieve your aligners. It's hard to say without looking at your case, but ask your doctor, I'm sure he or she will have a great answer for you.