Implantation bleeding or early AF?

Alexa

I’ve never been pregnant before, but this is the first month me and my hubby have actually tracked ovulation and everything. I’m on CD 25 and 11DPO. When I went to use the bathroom today I noticed light pink discharge...could this be implantation bleeding of early AF? I’m not due to start till the 22nd so I’m praying this isn’t AF.