Had a chiropractic neck adjustment 72 hours ago and have had neck pain and occipital headache on my right side since. went to urgent care and they dx with tension h/a. if i was to have a stroke would it have happened by now?

Chiropractic high velocity, high amplitude, neck manipulations, in my opinion, are archaic and risky, and should never be done, and most chiropractors avoid this approach. In your case, you had an adverse response, unlikely to have developed arterial dissection secondary to your neck treatment, but this could be delayed. Contact your regular physician, and discuss whether Carotid Duplex needed.