Not sure what’s going on

KRL

Hi so I started my period December 26th & after i ended not even 6 days later i started spotting or so I thought. It’s going on 3 weeks now & sometimes it’s heavy like I’m on my period & other times it’s like regular spotting. I went to my doctor & she said it was just little spotting, but im getting worried since it has been 3 weeks & now it’s getting heavier again.