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Technically you could have still existed, but it depends on what you consider you.
Speaking on terms of probability, there's a chance that the sperm cell that takes your place is, genetically speaking, a perfect copy of you.
The question comes down to what defines "you", your genetic material, or specifically YOUR cells.
If you go by genetics, then yes, because you've just been replaced by you.
If you go by the fact that you were that zygote, born from THAT sperm cell meeting THAT egg cell, then no, it isn't.
Is a clone you, or is it a clone? Can a clone take your place?