My headvoice

Hi, so I have been sick with a cough and cold for a week and I am finally better. I started doing the KTVA exercises again and I find that when I go into my head voice it sounds very fluty, sorta like my falsetto. Would it be because of my cold that I just had. Usually I can go into my head voice pretty well. When I go from chest to head I can hear the register break. But before my cold, there was no register break, only sometimes.