ice lemon tea!!!

Hi Mummies, currently I'm 16 weeks preggy going to 17 weeks soon.. I realize I everyday must consume at least 2 packet of ice lemon tea. Right now ice lemon tea is like my energy booster. I only crave for ice lemon tea so far I dont crave for any thing. Will it be harmful to my baby? Is this consider as moderate amount? I'm worry it's too sweet for my baby.