Well, as someone who has had three m/c and one second trimester fetal death, I'll give you my thoughts.
The first thing I thought when I read this new study(which I just did a moment ago) was how do they know the caffeine is causing this? And, of course, there are OB-GYN's saying the same thing.
Two of my m/c's were caused by genetic abnormalities(the third happened VERY early so there was no testing.) This study says NOTHING as to whether caffeine causes genetic abnormalities. In fact, they did no testing on any of the m/c fetuses.
The large majority of early miscarriages are the same as mine: genetic abnormalities. Whether you drink caffeine and smoke crack or eat only fruits and vegetables and never have any caffeine, you can't control genetic abnormalities. You can be the healthiest person in the world and you can still have a m/c due to a genetic abnormality. My last RE siad to think of genetics as a crap shoot. There is no rhyme or reason and you can't control the outcome.
Having said that, I do think that if there is the possibility that you are pregnant you should try to scale back on the caffeine. Can you limit yourself to one cup a day? I don't think that it can hurt to err on the side of caution. JMO
Sorry for the book, but I would hate for anyone to feel like they *caused* there own miscarriage through their choices when, in reality, in 60-80% of cases you have no control over this.
Good Luck to you!