Implantation bleeding or weird body/start of period

Hannah

I put a pad in because I saw some very very light brown/yellow discharge and this is all I got and how it looks. My period is in 4 days according to when I ovulate. I had sore breasts which went away today and I tested negative today (11 DPO) which lead me to believe I’m sadly not pregnant, but this is odd and I’m needing some insight please.