Could I have implantation

Emily

So I started spotting today and then it stopped a few hours later. I had takin a plan b on July 26 and im 5 days late for my period as it says on here because I was supposed to start on the 28 and end on the 2 of the next month so like (July 28–august 2) and I have started spotting a red dark drown today then it stopped and I’m really scared😬