Why brown blood/discharge for 2 weeks? 😟

My husband and I had a little intimacy during my last couple of days of my period in March. He came inside of me and then about 12-15 days later I started having brownish blood/discharge. This was during my ovulation period. The brown blood continued for about 2 weeks, off and on. I was scheduled to get my period last Friday and I thought I did, but it was not as heavy as it always is. I would wake up in the morning and have a decent flow, but then the rest of the day it wasn’t anywhere close to how it usually is. I’m on day 4 of my “period” now, but I’m barely bleeding. I usually go 8 days during my period and I’m barely bleeding on day 4. I usually bleed through ultra tampons every 2 hours during my period and I’m barely going through one every 6 hours. Am I pregnant? Is this my period? What was the brown blood? Is this because of change in exercise and stress. I’m really confused. I am sorry for the graphic photo, but I am very worried. Why 2 weeks of this color discharge/blood. I took a pregnancy test on Friday and it was negative. Was that to early!? Help!!