Implementation Bleeding

Kevelle • Zahir Ahmad Baker born 8/15/19 💙 Zari Anise Baker born 6/29/22 💗 Baby Baker # 3 on the way 🥰
I think I'm experiencing implementation bleeding but I've tested 3 times. All negative with the 1st one bring on the 21st. My period was due Nov. 21st. I wiped on the 25th and it was a tink of pink so I put a pad on thinking AF was headed my way. Checked the next day on the 26th and it was just a brown spot. So all this weekend when I wiped it was a light tint of pink. I'm confused. This has NEVER happened to me before. Someone said it could be stress but I can't think of anything I'm stressing about. I wasn't trying to conceive but either outcome will be fine. Help.