Help?

So I need some help. I started bleeding on the 9th, it was a light pink spotting. I thought it was implantation (I was 10dpo and my af wasn't due for 4 or 5 days) the next day on the 10th i was still spotting. Now here I am on the 12th. I've been spotting for 4 days. It's been ranging from a rusty brown to a red (but not bright red and no clots). To a kind of pink. My actual period wasn't supposed to start until tomorrow. I'm not cramping at all, (if I am it's so light I don't notice). I've been taking tests and they all come up BFNs. Could this be some kind of implantation bleeding or did my af just come early and weird? (Normally I spot for a day before af but not 4..) I don't have really any symptoms. A little breast sensitivity but I literally always have sensitive boobs so that's not much. I'm breaking out more? I don't know if it's just the tests I'm using (the clinical guard strips) or if my af is just acting up. Thanks in advance