Mini Pill Question - Possibly Pregnant?

I am 11 weeks postpartum.

I started the mini pill September 9th, and the last 2-3 days I’ve had small amounts light pink/light brown spotting. The only time I have ever had this other than now was when I had implantation bleeding with my son. My last period was September 16-20th. I take my pill every day around 7-9 pm. I haven’t missed any. We don’t take any other preventive measures to prevent pregnancy.

What are your thoughts?