light spotting instead of heavy flow?

so i have endometriosis and i have extremely heavy periods& horrible pain. this is the time of the month where i have my cycle. i’m experiencing some discomfort but hardly any pain. i’m barley spotting. i’ve been this way for 3 days now and i keep thinking it’s just the start of my period but she’s not fully coming. i literally love this since i barley have any pain but this isn’t normal for me. does anyone have any advice on this? thanks!