Out of bronze V, but with 0LP, in bronze IV, If I lose 1 game now, do I go back?

Hello. I just got out of Bronze V. I am now in Bronze IV but it says I have 0 LP. I am worried that if I lose a game now I will go back to bronze V. It was really hard for me to win a promo's... I would always lose them every time... So I am worried to go back to bronze V If I just lose now. Please tell me not?
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