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Sometimes if there is relatively high resistance in the primary fets or the winding, then the flux walking doesnt so much happen.

Though if you scope your primary current, through eg a low value resistor, then you will be able to see if there are signs of impending saturation. (ie, it has flux walked a bit, but not yet catastrophically).

Also, if you have done an "integrated transformer", ie, with inbuilt "extra  leakage inductance", then it will be more immune to saturation, as the leakage inductor is effectively air-cored and so wont saturate.