I am curious that you bet so early. Is it that you just like the line that got and wanted to take it before it changed? Do you worry that a player gets hurt in practice or enters the portal or opts or something else that could have a big impact on the game after you have made the bet?
Good question and to piggyback off Erial's response...the sharpest lines are the closing lines, after the market has picked at them all week. IMO, a huge part of sports betting is getting the best line. that extra 0.5 to 2 points you get can make the difference between a winning and losing bettor. A bettor that waits until game day to make all bets is going to struggle to win long term.
I keep power ratings for every team and adjust them after every game. From this, I come up with spreads for every single game and then compare them to lines when they open on Sunday. If there is a sizable difference between mine and the actual line (or a small difference that is around a key number of 3, 7, etc) that may trigger a bet. I'm more apt to bet favorites early and wait on dogs since the public will tend to bet the favorites more. This may sound silly, but I'm just as happy, if not more, when a line moves in my favor than if I actually win the bet. I've graded every one of "my lines" for years against the open and close. My theoretical win percentage on all games is about 51% to 51.5% on the open and goes to about 50% at close, so there is concrete evidence.
I don't worry about injuries/portal (or coaches suddenly getting fired but coaching the last game!). That can just as easily happen to the other team and work in my favor. Bowl games are different these days. I will wait on a lot of those games to see who opts out.
