If a T says to call, they do mean it, it is something that you CAN do! ANd if you need to, if you feel the need to, then by all means do call.
My T has said to call, if I need to. At first, I rarely did, because I did not want to be bothersome. But I have learned it is better to call if I need to than to not call! So I call more often now when things feel too hard, but I still try not to call every week!
My T actually thinks it's progress that I am more willing to call when I need to!