No AF, Last Period Jan 28 Lasted till February 1

Jermesha
I haven't had a period since January 28 it lasted 5 days ended February 1. My next period was due March 4 or March 6th I believe.  I tested March 11 with a early response. It was Negative, Was it too early ? When should I test again I'm on Cd50 I believe. Helppppppp