Re: asking for a raise....
in simplicity with all things being satisfactory;
- if your boss said that you will be getting a raise then you should be expecting a rise.
Most companies have the probationary period review face-to-face with either the line manager or the HR dept. I would ask for it at that point. If you don't have this then I believe its worth asking the boss later on incorporating the above mentioned points by Asif.