I was supposed to get my periods on 1st of jan.. But its 15th today and I have not got it yet.. I did the pregnancy test.. it showed negative. . I have been having irregular periods. . But has never extended for so long.. maximum was 40 days.. not a single time it has gone beyond 40 days.. also I have no symptoms of getting the periods.. what should I do? I'm worried!

When did you take the pregnancy test. I would try again today because the only reliable symptom is a missed period. Which you have.

If it still comes out negative I would book an appointment with your doctor. There are many things that could delay a period, stress and illness being the major, but the properly diagnose this requires a professional.