Menstrual issues

Stephanie
So here's the issue . I was 6 days late getting my period. The first day, I had a little bit of brown dishcharge and it had 3 tiny pin sized dots in it. The next day I had brown dishcharge mixed with pink red blood. And now , a gush of watery dark, and I mean dark red blood mixed with the brown dishcharge . Dishcharge is gone now but blood is very watery and only really comes when i pee , or put pressure (gas or bowel movement) is this normal ? The flow I would say is light-medium and I had my blood test to double check if I'm pregnant (bfn on urine yesterday ) just looking for some answers