Implantation bleeding question..TMI

So, since yesterday evening I've been spotting. It's only been when I wipe and it looks like this light pinkish color. I also have had little bits of brown discharge. It's been off and on and only when I wipe. I decided today I would put a tampons in to see if the flow changes or stops. Both times its been dry with a little bit of pink color and some brown. I'm already 4 going on 5 days late if I go by my 28 day cycle. Last month I was 4 days late but AF showed her face. I just want some opinions and advice. I don't want to test yet. I want to see if I stop spotting or if AF does show up. Thanks ladies😊