My budgie layed eggs and didn't hatch why?

have male , female budgie have 6 eggs . layed every 2-3 days , when count supposed hatch after 18 days didn't hatched , waited 3 days other eggs , didn't hatch too. let sit on them or throw them away if let sit on them can harm her?

i have male , female budgie have 6 eggs . layed every 2-3 days , when count supposed hatch after 18 days didn't hatched , waited 3 days other eggs , didn't hatch too. let sit on them or throw them away if let sit on them can harm her?

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