Hi @ez1138,
Please consider using the trigger Recurrence. Then select Month for Frequency, set Time zone and Start time.
If you are using SharePoint list, after the trigger, use the action Get items.
Then a Compose action and the following function to return the total number of items created.
length(body('Get_items')?['value'])
Please take the screenshot for a reference.

Best regards,
Mabel Mao