I can't see the month of may for adverstising charges. Does this just happens when the month is over?? Billing Summary > Advertising Charges How to check your current month adwords expenses? Just by all campaigns and then this month??
Look in the help section but here it is When you create and activate your Google AdWords account, Google charges you a one-time activation fee. Then, we set your initial credit limit at US$50 (or your local currency rate). Your credit limit is raised in increments each time your account hits its credit limit before 30 days have ended. The initial credit limit of US$50 is first raised to US$200, then to US$350, and then to the final limit of US$500. Each time you reach your credit limit or after 30 days, a new billing cycle begins.