SPOTTING. HELP !

I started lightly spotting on Sunday (about 6-8 days before my period was supposed to start). At first I thought it was implantation bleeding but all the websites I read said that usually only lasts a few days and I have been spotting every day since (6 days now). Sometimes it's pink, sometimes a brighter red, and sometimes even orange in appearance. The flow varies a lot, it's usually pretty light but last night I got up to pee and when I laid back down I felt a whole drop come out and it was bright red. It's nothing like my period though. Has anyone ever had this ? I took a test a couple days ago and it was negative but technically I'm not late on my period just yet. Could I be pregnant or is it some kind of infection ?