ADHD and struggling

So I'm 9 weeks pregnant and have a job that requires a lot of brain power. It's a challenge when I'm on my ADD meds and now that I have to be off them for the sake of Speck, I'm basically on the verge of getting fired I've made so many mistakes. 
Who else has struggled with not being able to take ADD/ADHD meds and how have you coped? This is not a matter where "writing things down" is going to save me either. Go!