What is the situation around "no chance" is this because you haven't had intercourse or because you have used protection or had a negative pregnancy test?
If you are certain you could not be pregnant, there are many things that can cause your period to be late. Stress, poor diet and exercise, late ovulation, medication etc.
Otherwise on the more severe side, the cause could be around a potential disease or virus.
Pregnant or not, you should see a professional GP for a thorough examination.