Clomid: how many follicles to cancel?

Spec
Hi everyone,
My FS put me on clomid this cycle, and I have a scan to check how many follicles are maturing and when to trigger. 
He said that if I have too many follicles, they will 'cancel' the cycle because of the risk of multiples. 
Just wondering if anyone has been cancelled, and how many follicles is the cut off?
Thanks 

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