Welcome-
Is your primary in a bucket? A lot of time, the lid doesn't seal well and you don't realize that it's going like gangbusters.
Peek inside. Is there a krausen? If so, leave it alone. The CO2 is leaking out and that's ok because there's positive pressure keeping the bugs out.
Is there sign of a krausen ring on the side of the fermenter like this:
If it looks like that, it's already fermented. Let it age for 2 weeks then bottle it.
If it looks like when you first put the wort in, get another packet of yeast and repitch now.
HTH-