Birth Control Spotting or Implantation Bleeding?

So my boyfriend and I had unprotected sex and as far as I know he hasn't gotten anything in me. But the day it happened I didn't take my birth control in the morning (which is late for me so oh god) and we had sex roughly six days ago and as I was peeing I noticed a suppper light brown spot in my panties that's small, and I don't know if it's just because I took my BC late, or if it's because of implantation?

I just don't have room for a baby right now 😅