Bleeding gums

My gums have been bleeding for around 3 weeks now. I went to the dentist and he said I have gingivitis and need to floss more regularly and should go see the hygienist — I did all of the above (scale and polish, and brush/floss more often) but my gums are STILL bleeding. I’m beyond frustrated and starting to get so worried, couldn’t get a dentist appt for a while does anyone have a clue what might be going on ??