Feeling more relaxed after my ADHD meds wear off - normal or strange?

Hey everyone, I'm Brandon, 28 years old and about 80kg. I was diagnosed with ADHD last month and have been taking dexamphetamine for a few weeks now - 10mg in the morning and 5mg in the afternoon. I've noticed something interesting - I actually feel calmer in the evenings after work, even when the medication has likely worn off. I'm much more relaxed before bed compared to how I used to be. I'm not sure if this is because I've had a more regulated day due to the meds, if it's just a placebo effect, or if maybe it means my ADHD diagnosis was wrong. Has anyone else experienced feeling more chill after their meds wear off? Is this normal or a weird sign? I'd really appreciate hearing from others who've had similar experiences or thoughts. Still trying to figure all this out. Thanks for any input!