You can see how your rate of spending compares to the recommended rate of spending. Simply look at the date line on the Spendable bubble. If your remaining Spendable is below this line, you are spending at a quicker rate than recommended. Your daily guide number, which is your remaining monthly Spendable divided by the number of days left in the month will be lowered accordingly.
If we anticipate that you will need more money than your remaining Spendable to finish the month, we will provide you with an alert in your transaction feed.
PS - Keep in mind that transactions made in latter part the prior month may clear next month.