Spotting?

I had my period July 1-6. Then again the 25th-29 due to starting provera. 
I never spot, ever but the 30th and 31st I was spotting. No cramps. Very light-pinkish/brownish color. 
Is it possible to that I'm pregnant? I tested a week before my period started because we were going on vacation and it was negative. 
Should I try again? If so how long?