The women had followed Jesus from Galilee. They had witnessed the crucifixion. Having accompanying his body to the tomb. They withdrew in time to recognize the Sabbath.
On the first day of the week, at early dawn, the women brought spices to the tomb. But, when they got there, they saw that the stone had been rolled away from the entrance. They went in but couldn't find his body. Suddenly two men appeared to them. The women were then told that Jesus was not there, but he had risen.
The women told the disciples what they had witnessed, but weren't believed. Peter did go check for himself to see if the body was missing. It was, but Peter still didn't believe what the women had told him.