This looks like breakthrough bleeding due to irregularity in taking the pills rather than any implantation bleeding. Moreover you had protected intercourse by using condom. Hence chances of pregnancy are less.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.