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I understand your concern.
One Step PLAN B works by delaying or stopping the ovulation.
So their is a fair chance that you will be protected since their is delayed ovulation in this cycle.
But One Step PLAN B may not be 100% effective and it may have a success rate of 89%.
In my opinion you can safely miss the next packet dose assuming to be protected from previous packet.But the protection rate may not be 100%.(May be 90%)