Advice?

Miranda
Hello ladies,
AF was supposed to start about 4 days ago, it hasn't appeared it, so I tested yesterday and it was negative. I've had light pink discharge (not much) a couple weeks ago, and quite a bit of fertile discharge still appearing. My boobs are tender and so are my nipples, but other than that I don't fee much different. Any advice on why my period could be this late? Or did I test too early??