Is this implantation bleeding or early AF ( spotting)

I’ve been spotting for the past 5-6 days like this

My boobs haven’t been tender, sore, or shown growth. I don’t feel nauseous. I missed my period by one day. I took a blood and urine test, it was negative. ( I took plan b and birth control together 2 weeks ago because, I was afraid the birth control wouldn’t have worked )