Yes...I had that for about 3 days after my first couple weeks of HCG.
It was explained to me this way...since our abnormal fat fills in between muscle and fills all the extra space when we lose that fat our muscles have to adjust and tighten back to where they are supposed to be. Which is why with HCG our body shape changes...when the fat is gone the muscle has to work to take the fats place. You are not building extra muscle it is just moving, therefore causes muscle fatigue and sometimes very sore muscles. Hope that helps!
