Iced tea during pregnancy

So just went to Wagamama to have lunch and got my usual which includes peach iced tea (large) didn't cross my mind that it contains caffeine! Finished the whole glass! Just found out I'm pregnant a couple weeks ago so still not use to watching what I can and can't eat. I'm already anxious about everything already so this has really got me going 😫 so of course I googled it and this was the first article I see. Please tell me I'm still ok and it was only a glass so won't do any harm?? Has anyone else had iced to during pregnancy and is it that bad??