Can I drink iced tea??

This is my third pregnancy with no babies. I'm in my 9w right now. I hate coffee now which before being pregnant I drank 2-3 cups a day. Each pregnancy I hate the taste of it, I don't drink soda, no caffeine unless I eat something chocolate (which is rare). So my question is I know certain herbal teas are not okay, but is regular brewed iced tea from Dunkin donuts okay?? It's a nice warm day and I'd love some for on my way to work with lemon. I can never get a solid answer on this and unless I know for sure I don't chance things. TIA!