will i get demoted if i lose my first game in a new division?

I recently got demoted to silver 5 because i accidently picked ranked and didn't try.. I worked hard to get back in silver 4 after winning 4 games straigth :D so now im at 0lp and my questions is will go back to silver 5 immediatly after losing my first game in this division? sorry for my bad english
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