AF or Implantation?

So today, I checked my cervix this morning and nothing, it was high, almost completely soft and closed. It was also hard to check because the muscles were tight. So then I checked this afternoon again and it was the same but then I had the tiniest bit of blood on my finger and so I put a pad on and when I checked the pad it had two dime-sized spots of brown blood and no blood when I pee, and really light blood when I wipe but nothing else. My periods are usually heavy and I've never really 'spotted' before I start, I usually just suddenly need to put a tampon on because my undies are (sorry for tmi) soaked in blood. Could this be implantation or do you think it's AF? Here's my calendar too. 

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