Red Bull and TTC!

I have adult ADHD. In order to have a safe pregnancy, I am completely off of my Adderall. Some days it's an extreme struggle but I know the end result will be more than worth it. I found if I drank 1 Red Bull a day, it helps me so much. It might be a placebo effect but hey it works! My question is this safe while ttc???!! I in no way want to harm my baby. Advice?? Once I do get pregnant I will no longer drink ANY energy drinks.