I have a 7 YO cow, never have had any calving problems. She has a uterine prolapse showing when she is laying down. not all the time, but I have seen it twice in the last several days. About the size of my palm. it does not show when she is standing up. She probably has another week or two to go. should I have the vet come out now, is there anything he can do? Will she for sure push it out when she calves? Any advice appreciated.