How do you know you're 14 days late - as in, what method are you using to determine ovulation, and how many days post-ovulation are you?
If you know that you ovulated, and that you're 28 or so days post-ov, then go and see your doctor.
If you don't know for certain that you ovulated, it's highly possible that you ovulated later than usual for whatever reason - stress, illness, travelling can all contribute to a delayed ovulation (and to many of your symptoms!). Also, most women experience an anovulatory cycle from time to time (when no egg is produced). So it may be that your period isn't late at all, it may not be due for another week or more.