When you click on the up vote Exchange , and as it pops up , if you see on the right side , the number of up votes you are due , would be shown there , and the system keep on displaying your most recent post unless and until it is up votes equivalent to the number of up votes you used for others. It happens automatically and you need not to worry at all,

You can have a track of your up votes here.
https://www.steemnow.com/