When did she calve? Bull bred or AI? Sometimes breeding, wether ai or bull can get some "stuff" in there. They will almost always clean up again on their own. Is there a lot of dishcharge or just a small amount? Somtimes you can get this when using cidrs in a sync program too, same thing you get some forign contaminents in there, once again ussually not a problem unless there was a huge amount of contaminents.