When planting in soil (whether I've pregermed or not), I've found it necessary to cover with some sort of humidity dome, as it's so dry here (Colorado). If that's an issue, you might want to consider that (so it keeps the top of the soil moist as well. I just use saran wrap and poke a couple small holes.
Anyway, I hope you didn't pack the soil too tightly, or the seed(ling) will have a hard time pushing up through it, and may not make it. Depending on how much you compacted the soil in the pots, it may cause issues for the roots as well, as they may not be able to grow as easily/may suffer from a lack of oxygen. It might be worth softly and carefully loosening some of the soil above the seed, so it can make it out. It might also be worth using a bamboo skewer or clean pencil to poke down into the soil and loosen it up some/aerate it a bit...carefully.
In any event, good luck!