Give me answers‼️⁉️‼️ Black spotting and then this cm 13dpo

So really late last night I thought I started two days early,I wiped and had what looked like really dark & heavy beginning of period blood and I’ve been cramping so okay sucks whatever. This morning (6ish hrs later) I changed my tampon and it has this BLACK blood like goo on maybe 1/3 of it. I thought maybe it’s just light & it had extra cm.....there is no trace of blood in my vagina at all & this is my cm....should I wait a few days & test? It’s completely normal for me to skip periods without being pregnant but this is crazy to me. I know cm similar usually means really fertile but the spotting has thrown me off this close to af. If I’m randomly ovulating twice my ovulation spotting is usually bright pink and lasts a couple days (already happen this cycle)