If it still looks like it does in the pic and it's hours later you should be okay. It looks like a fine young little seedling to me.

My personal opinion is there is nothing you should add to your seedling except water. I'm not telling you to go water it if it's moist already, but I wouldn't hit it with any nutes yet. Likely that if it did get stressed, adding nutes will further aggravate that stress on such a young seedling.

Hang in there for a day or 2 and keep us posted.

Also, if you can get some airflow around the plant, just enough to jostle it a touch, not enough to shake it vigorously, it will encourage the stem to bulk up a little quicker. Defense mechanism, if it doesn't need strong stems, it won't put as much energy into it. If it's shaking about just a tad, it'll interpret that like it needs a sturdier stem to stay alive in it's environment.