I am having a FET on August 12th. Should I stop my adderall (dextroamphetamine and racemic amphetamine) (ADHD) and hydrocodone 10/325 (chronic neck pain) before this procedure?

Good idea! It's a good idea, if circumstances allow. In any case, Discuss it fully w/ your Dr (s). The risks are increased for the baby, but are still not 100% to occur and it could be that the alternative distress is as bad an option. Your case is unique - discuss it well. Good luck - I hope it all goes well.