C.M.
Drip coffee has the most caffeine (about 400mg per 16 ounces), so I avoided it all together.
Lattes (contrary to popular belief) actually don't have much caffeine. Most espresso is 70/75mg caffeine per shot. I actually called Starbucks to get this information.
My first trimester I was SOOOOO sick that coffee grossed me out, but after that I had a half decaf latte nearly every day (so only 75mg of caffeine or so). I would get headaches if I didn't have any caffeine at all and I figured a little coffee every morning was not as bad as taking Tylenol every day.
The Light Frappucinos (if I recall correctly) have 180 calories and 1.5 grams of fat in a grande. I *think* 130mg of caffeine. That was my little treat to myself when I was 9 months preggers in swealtering hot august.
Anyhow, my doctors and everyone else said it was completely fine if you are otherwise healthy and have a low risk normal pregnancy. So, if you love it, I would say go for it.
You can call Dunkin Donuts and ask them for specific caffeine content of particular drinks too. They will have that information. Starbucks told me that was a very common question.
Aslo, everything I read or was told stated that 300mg was an OK amount to have in a day.