Pregnant?

Hello! I was curious if the test is inaccurate. I have been off birth control pills since Sept 2010 and my periods have been regular til last Oct. My husband and I had a wonderful marriage on the 3rd of Sept, 2011. I have an app on my phone called "My Days" and it keeps track of when I am suppose to start and when am I ovulating, it has helped alot since I have a 35 day cycle. I was suppose to start the 13th of Oct and I was 3 days late. Scared the ba-jesus out of me thinking I was pregnant that fast, but nonetheless I wasn't. November was on time then December was 2 days early, was only 2 days, and not heavy at all. I was suppose to start on the 26th of Jan, 2012 and I took 2 test; one yesterday night and one this morning and it said no both times. I am curious, would an ept test be wrong and how long should I wait to see a dr if my period doesn't start? Any help is greatly appreciated. :)