3 Days Late Have Been Extremely Tired Recently Today I

3 days late have been extremely tired recently today I was driving and all of a sudden become very lightheaded and felt a bit strange.
Also i had an increase of disharge then it stopped and I was having Pre period like cramping then the day i was due on the discharge stopped, but no period. The following day the discharge then started again and have been having mild cramping but still no bleeding. Feel like any moment I am going to come on my period.