If you are curious on how many sessions are left on your account you can easily find that within the online or mobile platform.
If you are logged into a web browser you can view your remaining sessions, when you are on book sessions screen. The popup in the screen below will appear after you have clicked on a available time slot. You can see in the package section it will tell you what type of package you have along with how many sessions are remaining in that package.
If you are on the mobile app you can see the remaining sessions after you have selected a time you want to book for. Below you can see where it tells you the remaining sessions.