Implantation Bleeding?

Ended my period 12 days ago, and am due for it in 14 days. I'm not sure exactly when I would ovulate since I'm on the pill (and have been for about 6 months). However, I used to ovulate the week after my period.

The past 3 days I have experienced spotting, the first day was light pink and the following days are light brown. There has not been red at all. I have had some cramping, and I've felt sick to my stomach these past few days. Could it be implantation bleeding? I took a test 2 days ago but got a BFN. Wondering when I could potentially see a BFP.

Thank you!