Over watered?

That's a fairly big pot for a small plant. It will probably take nearly a week or more before it needs another irrigation. 1 early irrigation won't be the end of the world. You might get soem fuzzy mold or green algea growing on top soil if it remains too wet for too long. Neither is a huge issue, but not optimal, either. Algea will steal a bit of N from the top of soil (it won't grow into it because it needs light). The mold is usually harmless and feeding off of some decaying organic material. When i transplant, i typically knock that top layer off and top off with some fresh substrate as i transplant. If you stick to a good wet-dry cycle you won't have any roots in that top 1" or more, anyway. Superficial roots are not optimal. just wait for the top 1" to start to dry. That plant will have a taproot all the way down by this points, so i wouldn't worry about it dryign up top. During first day or 2 after sprout, if by chance it was drying out too much up top, i would water slightly early in that context only - if i think the roots are so small they haven't had the time to drive donw far enough. dry roots for a seedling is a problem to avoid. Usually there is no need. So, wait for that top 1" to dry before irrigating. Always saturate entire pot so that the top always dries first. this promotes deeper roots and avoid superficial roots. In flower if you want to gas it more, you'll have the root system to take advantage of it. A little stress for roots to reach for water early on is a good thing. The plant will grow more roots in that context. Then as flower starts you can water a bit more frequently and take advantage of the extra root mass when it matters most - bud development. Don't go crazy about it.. need some minimum drinking to occur between irrigations and proper drainage qualiteis to avoid root rot (50% perlite or similar amendment will ensure proper drainage and o2 penetration for roots)