I've had brew in this gravity range completely finish in 3 days (not typical since I prefer a slower ferment, but it has
If you want to play it safe, give the fermenter a swirl to resuspend some yeast and leave it for a day or two more or even a bit longer. Even if it is finished, a couple extra days on the yeast won't hurt.
It's not a strong beer you're making (considering your estimated OG) so you're probably be fine.
It's situations like this that command us to call up the old "...relax, don't worry..." mantra. Once you get a bunch more batches under your belt (a belt which, by the way, will probably eventually need a few extra holes as a result
) and once you settle into the process, have confidence in your sanitation, and learn to just trust nature to do the job of fermentation, the worry aspect will disappear almost entirely.