I wouldn't say your example is wrong, but it is odd and unnatural.
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sb70012Can we use without delay at the beginning of the sentenceNot as in your example, because "without delay" goes with the final clause, not with the if-clause. You may find a sentence that sounds OK with "without delay" at the beginning, perhaps in a literary work, but it's better at the end of the clause that says what you should do (or did do) w