I drank one to two cups of coffee with each of my three children. I also drank diet Coke periodically throughout all three pregnancies...especially the second one since I craved it. I had about three a week.
All my babies are healthy 8lbs 14oz, 7lbs 3oz, 8lbs 15oz...all are very smart and ahead of their peers. None of them has any birth defects...
Now about teh worrying. Tell me what good is it doing you to worry about something that is done. You can't change it. You can't undo it. There is absolutely no proof one way or the other that it harms anyone....only mice that they give 100x regular servings....even I would suffer ill effects if they gave me 100x the recommended serving of ANYTHING.
Let it go!!! How does that religious phrase go? Something about not worrying about what you can't change. It's done, it's over...and your baby will be fine. Your worrying does more damage than that artificial sweetner.
Really just spend the rest of your pregnancy eating well, drinking your orange juice, eating your protien, taking your pre-nats....and all that jazz. Stop worrying about what can't be changed.
Prepare for that baby and focus on being a great mommy when he/she comes along.