I am trying to get pregnant but currently on my period, I am also in a really stressful time at work and need to keep my wits about me. I went off all my meds back in December and have been mostly functional but I am wondering if I can safely go back on my ADHD meds (dextroaphetamine) for a couple weeks, just until I ovulate, to get through this time at work? How long does it take for it to get out of my system safely?