I just got to Plat 5 today I worked my a$$ off to get there but I'm worried I'll go back to Gold

I have been trying to get plat for a while and today I finally did it. Now since I got plat I had a few celebration games playing champs I suck at. I'm sitting on a 3 game losing streak and scared to play cause I don't want to be Gold again. How many games must I lose to be demoted back to Gold 1 and kicked out of the league?
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