How did you file it Monday? Or think you filed it. Did you use the Online version? Online is only good for 2017 now.
You have to use the 2016 Desktop program and mail it in. After 4 weeks after mailing you can start checking IRS Where's my refund <a rel="nofollow" target="_blank" href="
https://www.irs.gov/refunds/">https://www.irs.gov/refunds/</a>
