Yes. As stated in in the Membership Agreement you'll be required to read and sign upon joining, a member can only accumulate a maximum of 6 Credits. Meaning that as the 7th Credit populates into that account on your billing cycle, the earliest of the series will expire.

It is for this reason that we allow members to use their credits for a wide range of treatments as well as having a maximum of 2 addition people on their membership at no extra monthly fee.