SPOTTING? IS THIS NORMAL?

Hello I’m 20 and I’ve always had super regular periods with no issues but this spotting has been happening for the full one or two weeks in between my periods for the past two months and has never happened before. should I call a doc or is this normal? help!! any similar experiences would be appreciated, sorry for the TMI photo but it is the best way I can show/explain what has been going on.

UPDATE: DOC SAYS IT’S NORMAL & JUST OLD BLOOD THAT NEEDS TO BE EXPELLED