On Friday of Easter Week, the Romans and Jewish leaders crucified Christ. Because he died quickly, Pilate gave permission for followers of Christ to have the body. These followers quickly prepared the body for burial and laid it in a tomb. The Jewish leaders worried that people may steal the body and pretend a resurrection convinced Pilate to roll a huge stone in front of the tomb opening and station guards outside it.
After that came Saturday, the Jewish Sabbath. As a sacred day, they focused on the prophets and did not do much. Consequently, nobody came to visit the tomb. We can imagine that his followers felt devastated at the loss of Jesus. Though he had prophesied of his resurrection, they did not understand and so thought him gone forever. It must have been a miserable day for them.