Since the normal processing time has not elapsed I would give it a little more time. From my experience the interview date can take up to 6 months. If you are desperate you can always schedule an info pass and ask an officer personally.
Because the normal processing time has not yet been reached. Estimated processing times are always as posted on the USCIS website.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.