Implantation bleeding or weird period?

I’ve had the weirdest symptoms this month (boobs grew, super tender, cramps since 4 dpo, headaches, nausea, peeing every hour on the hour, etc.) and my husband and I have been trying like crazy. We had sex every day of my fertile window. I’m now 3 days late, but a few hours ago I started having this weird pink spotting with some rust colored brown. Not a lot, mostly only noticeable when I wipe. I’ve never had this happen before. I only ever had my period start and be super heavy on day one, and it always runs like clockwork. I have not had a clear positive test yet, and I’m really confused if this is implantation bleeding or spotting or my period starting. Anyone else had any experiences similar to this or any advice?