Implantation or period??

Charmaine
I started my last period June 2nd which went into the 9th. I had took 10 days worth of provera. The 20th I noticed a brown spot In my underwear. The 21st a little more brown in my underwear and a tiny bit of bright red blood. Now today I'm having a little blood. Could this be due to the provera or could it be implantation bleeding? Could I be pregnant?