What does it mean if after 3 weeks finch eggs do not hatch?

If finch eggs do not hatch after three weeks, it may indicate several potential issues. The eggs could be infertile, or there could be problems with incubation, such as temperature or humidity levels not being optimal. Additionally, the health of the parents or environmental stressors could impact the hatching process. It's important to monitor the situation and consult with a veterinarian or avian expert if necessary.