Implantation bleeding?

So when I went to the bathroom today I had pink and some discharge. It is very light on my pad and having very mild cramps (not like my Af ones) and feeling nauseous and lower back pain. Does this sound more like implantation bleeding or Af? These symptoms are not my normal AF symptoms that is why I am asking. I never experienced this with baby #1 and ttc #2. Thanks ladies!