Does this cough sound serious?

Hi. We adopted my 12 week old kitten,Max, just over a week ago. He didn't have the best start in life and was really underweight when he got him. But he's now making great progress! Since he came home he's been coughing quite a lot. At first I thought it was just a hairball but nothing has come up. We... show more Hi. We adopted my 12 week old kitten,Max, just over a week ago. He didn't have the best start in life and was really underweight when he got him. But he's now making great progress! Since he came home he's been coughing quite a lot. At first I thought it was just a hairball but nothing has come up. We are bringing him to the vet tomorrow for his vaccinations and will mention this. He was wormed last week.
This is the cough: https://vimeo.com/229407781
If it needs a password it's Kitten
Thanks in advance x
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