Someone please helpppp me!

Heather

So I have been spotting since the 28 and during the day I wear two panty liners and I have an ok amount but at night I sleep completely naked (weird ik) and I will be fine this is the third day this has happened to me and I just had my period 1/12 and it was super heavy

This was the first day the spotting occurred

And this is what my panty liners look like..I have no idea what this could be? I just took a pregnancy test yesterday and it came back negative..