On the Credits page. You'll be able to see the total number of credits remaining, as well as a more detailed breakdown of the credits, including the source and type of credits earned, along with their respective expiration dates.
If you are subscribed to a credit subscription plan, you can view your subscription information from here.
In addition, the update time of credits is the day you purchased the subscription, not the 1st of every month. For example, if you purchased the subscription on the 20th, your credits will be updated on the 20th of every month.
You may also want to know :
How many credits do Pro members have per month? Do the credits stack up?
How many credits do I cost to generate an AI image?
If I Have Subscribed a Pro/Pro+ Plan, Can I Subscribe the Credits Plans?