Am I Pregnant? The Last Time I Had Sex Was

Am I pregnant? The last time I had sex was the 28th of july. We used a condom both times and he pulled out with the condom on both occasions, the condom was not broken. Beginning yesterday I was getting this dark brown clumpy discharge, and today I got the same except it was followed by red spotting. My period isnt due for 9 days, the 26th of august. Could this be implantation bleeding?