Will it... ?

Hello, after being on 0 lp and losing first match, I got demoted to gold 5, well it took me almost all night and morning but back to 4, hurray ,,, sort of. Only this questions me, now if I lose 1 game after being freshly promoted to gold 4 again, will I get demoted to gold 5 ? I really don't want to risk anything.

Thank you for your time, all the best !