The first set of leaves is round, thick, and looks nothing like pot. Those are the cotyledons, and they provide food for the plant and capture the first light for photosynthesis.
The next set will have only a single blade, and yup, they look like skinny nettle leaves.
The next set should have 3 blades, and the set after, 5. The baby plant does not have the energy to grow true fan leaves on the first try, so it works up gradually.