Yes you can take GH and HCG at the same time, not a problem. And you can continue to use GH while in PCT. GH is not a steroid and will not have a negative impact on your recovery.
As for your HCG use, you do not want to use it IN PCT. You want to use it before. HCG will force your body to produce test, but you need to be off of it in order for your body to recover. It's the the primer to turn the engine over, but the engine needs to run on it's own, without constantly being primed. I would suggest taking 250iu 2x wk through the cycle and then cutting it out about 3 days before you start PCT