It doesn't really matter if you inject now or wait until the next Test E injection. The main thing is that you hit the HCG twice a week. Your body is an analog system. That means that thing take time to happen. It takes time for the Enth ester in the Test to allow Test to be absorbed by your body. The Test uptake into your body is like a sine wave. You can pin the HCG anytime along your cycle. It's just better to do it earlier than later.