Implantation bleeding? TTC

So I was supposed to get my period on Monday. Saturday night I go to the bathroom, wipe and notice the smallest amount of a darker color blood with whiteish/clear discharge. I think nothing of it really and assume I’m getting my period because it looks like that in the beginning if I catch it waay early. Sunday comes, nothing. Then nothing on Monday so I take a test, negative. Tuesday and Wednesday (today) also nothing. Took a test tonight and negative. I’m not sure if I’m still too early to tell or what. I also have PCOS. But I’ve never not had a period before. Every once in a while it’ll come a little early or late but I ALWAYS get it. Please give me your opinions!