Normal, period, implantation or pregnant?

Hello ladies,

I've been searching for answers here online before I start to really be concern and book an appointment with my family doctor.

I am currently on the depo perovera shot, and took my very first shot may 2013. I am aware the it can lessen or get rid of my period but of course everyone's different.

while June 17 is when I would expect my normal period. Well for 10 days, it had been 10 days of non stop brown bleeding. It's not heavy, just enough to wipe and that's it, now today is the 11th day and it was pink, again not enough for a pa or tampon. Iv had little to mild cramps that comes and goes.

so my question is this normal or should I start to be worry and call my doctor?

i hope somebody will help me out with you're opinions so I can make a decision as to what would the next step be.