okkk what's wrong

Diamond
I started back on my cycle last month and this week I started my cycle on my regular date but this time something weird happened I started on the 20th and got off today on the 22nd that never happened like I'm spotting here and there but it'll go off then come back on should I go to the doctor I took a pregnancy test and it come out negative and I'm still spotting What Do I Do🤦🏾‍♀️🤦🏾‍♀️🤦🏾‍♀️??????!!!