My doctor's office of 5 conservative doctors has a policy of two caffeinated beverages a day. So, I'm guessing a cup of coffee is okay. I cut it out for my first too. I was trying to conceive for a really long time and was doing anything I could to get and stay pregnant. So, did it that time but then started on caffeine again (me? Dr. Pepper was the culprit) and did drink one a day in my second pregnancy. So, I think you are okay with your one cup of coffee and hey, life's hard.