Spotting at 15 DPO?

Hello ladies... so AF was supposed to come on the 3rd according to Glow, but it didn’t, so it moved back 2 days, but again it didn’t come today... so it’s been moved 2 days back again.

I’ve been feeling weird on and off.. can’t really describe it. My boobs aren’t sore but I’ve never gotten sore boobs around periods either.

I’m now 15 DPO, I have no PMS pain at all... I got some beige/light pink stuff today when I wiped. Once in the morning at like 8 and again now at 10:30.

Does anyone have any insight? I thought implantation bleeding happened earlier than 15 DPO but could that be what this is?

Help!