My Havanese Puppy Is Coughing?

I got a havanese puppy today. She’s very friendly, happy and playful, but when she’s laying down she starts to cough. (It sounds like a snort, but she opens her mouth when she does it.) Does she have kennel cough? Or is she not coughing, but doing something else like a reverse sneeze?
I can’t take her to the vet until Monday, since they’re closed on weekends, but I’m definatly taking her. (She still needs a one more shot.)