No, a chancre lasts about 3 weeks.
This sounds like a sore developed after you scratched yourself raw.
You did test a bit early for syphilis, but syphilis is uncommon in most developed countries, like the US, Canada, the UK, etc. If you feel you need to test again, test at 6 or 8 weeks. I wouldn't bother, but if it makes you feel better, do that.