Dog scratch no bleeding no tissue broken

Sir i was feeding a stray dog(that my family have been feeding since it's birth) but not know whether it is vaccinated or not.During feeding accidentally it bite me on my feet,but it was not a proper bite,there is no bleeding ,no redness,no tissue broken,only a scratch that happens when we scratch our feet by nails during winter(a white line),but preety sure that it came from its canine. After this incident i wash my feet with tap water and soap,there was no irritation or burning sensation, after washing i can't even find where it bite me(means there is nothing there,not even redness).To be on safer side   after 70 hours i took 1st dose of ARV as prescribed by my district main hospital doctor, and he has written 4 dose (0,3,7,28). I will take all those shots.The dog was fine and health during this incident and now also. My query is should i be tensed of having rabis, Is 3 days late to take vaccine, Pls answer  doctor ,i am very tensed,i am preparing for neet and can't focus on my study