what could this mean?

So I posted the other day about prego tests and which one, if there was any, was good and accurate to take. I still have strong suspicions of me being pregnant bc of the weird symptoms I've been having for the past 2 months (which are tender breast, very light 3 day period and it's usually 6 days & heavy, a little weight gain, mood swings from hell, major food cravings, frequently going to bathroom, things like that). Well anyway, I took a Clearblue test on Sunday morning to check and it came out to be a really really faint negative, like I could barely tell it was there but it was. So with that being said, would that faint negative mean the testing was inaccurate? Should I take another test but different brand?