Week before period, random blood globs

It only happened three times when I'd go to the bathroom, a big glob of brownish reddish blood would come out. I had no other bleeding. But mild cramps.  Then I would have some brown discharge. This lasted about three days. I tested the second day it happened with a BFN. I've also been extremely hungry. My actual period isn't due for a few more days. I also just had a very vivid dream I was pregnant, which is probably just because I think about it a lot. 
Could I still be pregnant even though I had that weird experience? Should I wait to see if my real period comes?