AF? or Implantation Bleeding?

Jessica • 35, ttc
After a light brown discharge yesterday morning, I woke up today to pee, wiped, and there's a pinkish discharge on the toilet paper. Nothing on the pantyliner though. If we are not TTC, I may think that it should be the start of AF, but since we tried this month, we are still giving the benefit of the doubt that maybe it could be spotting or implantation bleeding. I am watching on the color and amount of discharge for now. Cause if it is AF for me this month, it should be red bloody (Sorry TMI) and it should be the amount that I usually get when I have my period. For now, it's just when I pee and wipe, but no heavy flow yet. This never happened to me before. AF was due the 16th, 19th the latest. 
Not intentionally using Glow as a Diary but I just want to share this cause I know there are ladies out there who are going through the same thing and mostly confused. I already have 2 children and I had totally different stories about my pregnancy symptoms for both. So we never can tell. There is always something new. If AF comes, let's just be thankful for another month of TTC and having the chance to be blessed with an angel. Baby dust to all of us!!! 😊😊😊