Well, to me doesn't sound like it. Unless, you ovulated later in your cycle, and you've now been experiencing implantation bleeding. You're already around 2 weeks late for your period so I would go ahead and take another test, see what it says. If negative test again in a week, and then if you miss your next period make an appointment with your Dr.
I agree with julz, if you are still getting a BFN in a week I would go to your doctor and perhaps they can tell you what happened. There could be a slight chance that you are pregnant as some woman do spot during their pregnancy but if you are getting BFN than I highly doubt it. Hope everything works out for you, good luck.
A HPT typically detects pregnancy 2 weeks after conception. Its possible you ovulated late in your cycle and are pregnant buts its more likely you are just having an off-cycle. In any case, take a test in about a week.