Havent gotten a call from MAC in a while

Hi! So I've been working at Mac as a freelancer (I'm on call) since November. I worked a lot during the holidays but after that, they haven't called me into work. It's been about 2 months since I've been called to work. Does this usually happen if your on call?? Should I be worried? I'm not sure if this is a normal thing that usually happens. Thank you :)
 
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