You should go before the cycle to get a base line .
After, it really depends on the cycle and what kind of recovery you are doing. See, it´s important to get numbers that are not influenced by exogenous substances. So, any AAS , HCG or Clomid have to be already cleared out of your system. When using Clomid I like to get it done 2 weeks after I end it, since there might be a rebound inhibition, and if I test too soon I may miss it.