There is no way you e-filed your 2018 taxes last night. The IRS closed e-filing for the 2018 tax filing season on Oct 15, 2019 permanently and forever. It's also not possible for you to have used the online version of the program for your 2018 taxes either for the same reason. Maybe you used the Desktop version? If so, the only way to file your 2018 taxes is to print, sign and mail them to the IRS. Same for the state if you need to file a state tax return.
