Opinions? Implantation bleeding

KY

Based on my calendar I posted above could it be implantation bleeding? Had sex on the 18th. Spotting started on the 21st of this month and I still have it today. It hasn’t really gotten any darker than the posted picture and only happens when I wipe. My Period isn’t due till the first. I have two children and I didn’t experience implantation bleeding before so this is new to me. Also my periods are pretty normal and have never came early. If I take a test today is it too early? Or should I wait till expected period date?