You will have access to Wealthy Habits all the way to the end of your current paid period. After that you will be charged for the next period automatically and your access will continue uninterrupted.
For example, if you have an annual subscription, you will have access until the end of the 12-month period you have paid for.
If you have a monthly subscription, your access continues to the end of the month you have paid for.
If you wish to cancel at any point, your access will expire at the end of the current paid period. Until that point in time you will continue having access as before.