Questions about my BFP and implantation spotting?

If you were due on the 16th than it would be too late for implantation spotting. Implantation happens within 6-12 days past ovulation. Spotting in early pregnancy can be completely normal though. I would make an appt with your doc to get a blood test to confirm that you really are pregnant since you are only getting faint positives. Are you sure they are not evap lines? Just get a blood test and you will feel better. Good luck!