My one sprout grew the two smooth leaves, the two beginnings of pot leaves and grew..

[Mole2k4]

you could try holding it up,
As for why its got tall and fell over in the first place, the reason is poor lighting.
its stretching for light, and therefore the stem is tiny.
it might sort itself up if you hold it up.
unlikely though, but then, 2 seeds of mine are growing, about 2 weeks after they were planted
so miracles happen