Is buying a stock, holding it for a while, then buying more and selling within a day counted as a day trade?

I’m fairly new and haven’t really found much about this online so I decided to ask here. I don’t have the requirements in my account to be a pattern day trader, so I’m trying to make sure I don’t accidentally break the rule.

Let’s say hypothetically, I bought 3 shares of stock x a week ago. Then today, I decide to buy 1 more share when the market opens and sell 1 share of stock x later in the day. Would this be considered a day trade since I bought and sold a share in the same day or, since I had bought shares earlier, would it consider the “older” share as sold? Thanks for any help.