Unfortunately yes, if your employer is not satisfied with your work he or she may decide to terminate your job. Intrax would try to place you in another job (depending on if you have been placed by Intrax for your first job and on how much time is left for the program), but this is not a guarantee. If no other job can be found for you, you may have to leave the U.S. immediately due to your visa regulations, but this rarely happens!