From your symptoms, you seemed to have irregular periods (oligomennorhea).
I suggest you to remember if you have taken any birth control pills last month. If you have then it could be due to this. Else I suggest you to wait for another 3 or 4 days. Try doing urine pregnancy test again. If it turns negative again. It could be normal in some; the luteal phase varies from person to person. It can be longer some times in few.
I suggest you consult a gynecologist if you don't have period for a week. She will conduct a USG and look in what the problem is.