negative hpt but no period

A little background: I have my visit February 7-14. I'm normally regular. 
Come to this month. Ttc. No AF. Take a hpt - negative. Wait a few days. Still no AF, and another negative hpt. Wait a week and again same results. 
Fast forward to yesterday I had some spotting which I thought was my period. It lasted a few hours. Today, nothing. 
I'm not sure what to think. From what I've read, my ovulation should have been earlier in the month and this would be too late to be implantation. Any insight would be helpful.