AF or Implantation

Olivia

So, I'm confused. Considered myself out this month going on year 2 of ttc. Thought AF came to town but now I'm not so sure. Day one was normal (red/ not spotting but not heavy) . But I have cramps (very unusual) and night one everything stopped. Day two only brown/pink spotting and stopped again at night. Day three same thing. Has anyone experienced something similar? Not sure if this could be implantation or just a weird cycle.