What Causes Delayed Period With Invalid HPT?

Good day doctor, I am 1 wk delay of my period. I have unprotected sex 4 days before my period. My period history also differs as early as 27 days til 57 days late. I ve tried to induced my menses ,already more than a week til now but still no any signs or symptoms of my menses. I m so confused. What might be happening in my system? I checked my urine today but it shows invalid. I didn t also have any other unusual symptoms. By the way my last month period from Feb 8 til 12 so I should have March8 or 11. Please help me. Thank you