Kinsa presently tracks 40,000 users and asks a series of questions to help narrow down the type of illness the user is reporting on. For instance, Kinsa reports fevers of a couple days duration as likely being colds while week long fevers are more likely to be the flu. Their tracking methods have tracked almost identically to the CDC's reports for the last 3 years, only Kinsa's stats are provided much sooner. Recently Kinsa has been providing their results to their paid subscribers rather than to the public.
Today's NY Times (02/14/19) quoted Kinsa's founder Inser Singh: "The number of illnesses lasting longer than three days rose massively in the last few days.” Fevers of more than 3 days duration are categorized as likely flu cases by Kinsa.
What this means is that whatever the CDC reports tomorrow in its weekly report is most likely going to be far less than what they report in the next week or two. It also means the flu has likely started to rage in recent days.