frappe from McDonald's

So I'm 28 weeks pregnant and I'm craving a mocha frappe from McDonald's lol. I hate coffee and never drink it, but some reason I like the frappe. Haven't had one yet throughout this pregnancy. But is it safe to have one?? I've heard that drinking coffee is bad when pregnant and I think the frappe has some type or kind of coffee in it.  So is it ok to have one, or should I just stick with a milkshake??