Any advice?

So I suppost to start my period yesterday but I got sticky light brown mixed with bit of white but the same time clear discharge for about 2h max -2 trips to toilet. Since then nothing. Today feel like my stomach is “bubbling” but no pain really more like bit pulling sensation but its here and there like nothing really noticable. Took pregnancy test yesterday- negative.

It just seemed weird as my period was due and I just got that and there is nothing anymore.