I have a 28 day cycle, could implantation occur 10 days before expected period resembling a light spotting pink in colour and a brownish discharge?

Indeed: You are most fertile days 10 through 20 of your cycle (day 1 being the first day of your period), so 10 days prior to your period would be day 18. I would make sure you are eating and sleeping well, not drinking alcohol nor using drugs. I would advise a prenatal vitamin and take a pregnancy test if your period does not come. I hope you have the outcome you desire.