Implantation bleeding & symptoms

Demi • Baby #1 is now 3 & my best friend. Baby #2 is baking in my tummy 😻
I started bleeding 16dpo until 19dpo (pink blood) and I was so angry I thought it was af so I wore tampons but just realized there was barely any blood on the tampons ever and my "af" lasted 4 days instead of the usual 7. I'm taking a hpt today.