Is This Implatation Bleeding?

Hello,
I had my AF on OCT 21 (day 1). Yesterday NOV 7 I had a little pinkish/brownish discharge when I used the restroom. I have no actual blood on my panties though, just colored discharge. My cycle is usually 25 days and I calculated the dates and used an ov predication kit to measure my hormone levels. My husband and I are ttc and are hoping this is good news. Any thoughts, what do you think? My breasts are a little tender but no grealt painful. I have felt ill the past two nights but the flu is also going around at work. I am a first timer and don't know what to expect. Help please!