Dark Brown/Black blood?

Hey ladies!! So this is my 4th day on my period.... It's been a very unusual flow.. first it was light pink spotting, then regular flow for maybe an hour, then right back to light pink spotting, and now today I wiped after peeing and it looked almost black!? I haven't been going through pads like I usually do. I've only been using 2 a day, that's how LIGHT it is. Any ideas on what's going on? Google says pregnancy but I don't want to try that too much 😂