Implantation bleeding?

Ashley<3
So, my period was due around 14-15th. I had some bleeding this morning that I noticed, so popped in a tampon and expected aunt flow to come flooding in, but nothing has happened and I don't feel my usual excruciating cramps on my first day of my period. I've just had the light somewhat spotting... And i dont feel like I'm on my period. Being that I'm 2-3 days 'late,' could this have even been IB? Thanks for your input!