Hopefully you prepared a Form 1040X that you printed, signed and mailed to the IRS--that is the only way to amend a tax return. It takes 3-4 months for the IRS to process an amended return.
You can check on it here:
https://www.irs.gov/Filing/Individuals/Amended-Returns-(Form-1040-X)/Wheres-My-Amended-Return-1