I agree with @rjs and @JulieS that you should not amend the return until your original return has been processed.
Before you amend your return, have you compared the updated 1099-B with the original 1099-B. You may not even need to amend. To quickly determine whether there are any changes, look at the total of the transactions. Do the amounts match with the original return. If no changes, you do not need to amend.
If there are differences in the return, how much of a change, it may not result in a change in income or loss and the tax amount may not change, in which case you do not need to file an amended return.
