AF or implantation?

Charlotte • 👼🏼30/11/19💔 expecting our rainbow baby due 30/11/20🌈❤️

I suffered a miscarriage 30th Nov, stopped bleeding around the 2nd Dec and negative pregnancy test 17th Dec. According to my apps I was due to ovulate around 13th Dec but believe this happened 24th Dec as I had a positive opk and also ewcm. I had very light pink spotting after hubby and I baby danced 27th Dec and then nothing 28th and yesterday very light pink spotting today and today it turned to brown spotting but this is only present when I wipe. Could this be AF making an appearance and I never ovulated or implantation bleeding? I had a negative pregnancy test 28th