Tori, Welcome to ATP !!
LOL, we have all made many mistakes with our gardening efforts... unless you really want gazillions of plants, in which case you can likely take the whole plug out and gently separate those little seedlings to plant separately, I'd suggest using some small scissors to cut off all but 2 or 3 seedlings per plug. Then let those grow a bit more and transplant them to individual cells or small pots. (By using scissors you don't risk damaging the roots of the seedlings that you are leaving in place.)
I hope you have a wonderful gardening season !
