bought a 2018 nissan sentra in october of 2018 and it already had 17 miles on it; can my car be considered a new car?
Not now but it was when you bought it . Why are you even asking this question ?
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My 2002 new truck had 248 miles on it when I bought it. The exact distance from my dealer to the one where the truck I wanted was.
It was still a new truck when I bought it.
No, its a used car because it a 2018 model year.
The model year isn’t relevant in determining if it’s considered new or used. For example, if it’s a previously unregistered 2018 with 100 miles on it, it is still considered a new car. It would have to be significantly discounted for me to buy it however… 
It is even possible for a dealer to have a two year old “new” car on the lot. Sometimes a model without popular options and the dealer has been sitting on it rather than discount it to make a sale.
Why do you ask? I’m curious.
If you’re the first person that it’s registered to (other than the selling dealership), then it’s a new car. Most new cars will have at least a few miles on them as a result of being moved around lots or a couple test drives before they are sold.