You can get a free transcript from the IRS:
How do I get a copy of a return I filed using online TurboTax?
How do I get a copy of a return I prepared using desktop TurboTax?
Note: Every year, before mid-October, print a copy of your current year tax return and save it as a tax file and pdf, too. That way you will have it when you need it for school, a loan, next year’s tax return, etc. without going through a lot of aggravation (and expense) to get it.
Was your 2017 return prepared with Online TurboTax? If so, log in to your account and look in the section "Your Tax Returns & Documents." Choose tax year 2017, and look for a link to download/print the PDF. Do you find evidence of your return there OK, but when you try to download, does it ask you to pay? If it was prepared in Free Edition last year, access will be locked. If that's your situation, we can tell you how to pay to unlock your 2017 return. The method to unlock it depends on what all you have done with your 2018 return.
If you find no evidence at all of your 2017 online return in that account, we can tell you how to look for multiple accounts. A return prepared in desktop software (CD/download) will not be in an online account.