Implantation Bleeding

Margaret
According to my ovulation calendar, the spotting that lasted yesterday for about 8-12 hrs and has now stopped, should be implantation spotting. It's about 12 days after ovulation and about 7 days before AF. I've also had sore breast, nausea and sensitive to smells.
​I took a hpt this morning and it was negative. How long should I wait before testing again???