spotting or af at 4 dpo after smiley

Annie

please guys if someone can help me understand. ive tested with clear blue easy digital opk this month and I got my smiley late on cd 26. my normal cycles are 32 to 34 days on average.

however today at 4 or 5 dpo I am having very light spotting when I wipe plus some cramps it feels like the start of af. it is too early for implantation bleeding anyway. so why would I be having ag 4 days after smiley when I started testing early.