I suggest planting more if it is feminized or not! Plant TWO MORE and grow some for a friend! In all seriousness it is wiser to plant extras and cull...
If your plants are from seed there will be variation. That is normal and expected from seeds. If the plants are clones and one looks different it is...
If the seedling is not buried too deep it should have enough vigor to push through. Minimize your watering until you see a sprout. I would recommend...