Could I be?

AF usually last 3days max. Within those 3days I use up to 15 to 20 pads, she is always on time, so last month I had a doctors appointment and they said I was pregnant and drew blood and said the blood test came back negative, I got a period but in my 3days of bleeding I only used 5 to 7 pads, this month I took a hpt and it gave me a faint line, I then started light spotting the next day, so I got my period but only this time it lasted 2days of spotting and only 3 pads within those 2days. 2 days before AF 10/14/18 ⬇️

On 10/15/18 I started spotting and on 10/16/18 AF is due and came and left on 10/17/18 and today 10/18/18 this happens ⬇️

What should I do? What is going on?