My dog has a runny nose?

I just adopted a dog from the pound she seemed a little shy and scared but seemed to like me , she also had to get spayed before brining her home, she is home now they told us she would be out of it for about two days today is her third day at home and she seems tired but does look for me when i leave the room , she eats and drinks water and also goes to the bathroom but I'm more worried about her runny nose..its not alot but a lil, could it be due to the surgery?