As an obstetrician (humans.. not horses) I feel funny to ask, but...
When does it start to show that a mare is pregnant (not US, when you actually can see it)?..
When does they start to change their eating habits (I think mine started to eat more hay)?
Do you change the way you treat them (activity, nutrition, grooming)?
Anything else?
Thanks
(I was not that nervous when my wife got pregnant...
) 
