Thought I was pregnant.!?!?

Krystal • Family & Faith are #1.
Ok my lasts period was on the 11th of Feb, & I ovulated on the 16th.
​I track my ovulation each month wit testes.  
​I took a pregnancy test & it came up negative 4days ago. So I took a ovulation test. If it u are pregnant it will show up as a positive test.. is what the instructions said. Cause there more sensitive to the pregnancy hormone. 
So if I am pregnant.? 
​Why when I went to the bathroom this morning was I spotting a little. Or is it just a way late period. Cause I have no symptoms of my period. Other then that light spotting. & I've only spotted once.
​I'm so confused.?  Help:(