I have a black angus cow that should have calved on or about July 8. This was her date calculated from the time the bull was with her. She started stringing on July 7 and stopped. She still appears to be with the calf and is moving slow when walking, with no running. I am aware that she might not have been bred during her first cycle. My question is once the stringing started, why did it stop? Also, should I be concerned about the time issue?