If you prepared them using the TurboTax online product, here is how to access them:
To get back into your return after printing or e-filing, please follow these steps:
1. In TurboTax Online, sign into your account.
2. Select Tax Home in the left menu.
3. Scroll down to Your tax returns & documents.
4. Select 2018, and then select Add a State (You're not actually adding a state, this just gets you into the right menu).
5. Once you're in your return you can navigate around as usual.
https://ttlc.intuit.com/questions/3355524-when-does-access-to-my-prior-year-turbotax-online-returns-...
If you used the CD/download product to prepare your returns, the only copy of those returns would be on your computer or on a separate storage device if you saved copies to such a device.
You are always recommended to save a pdf of your tax return to your computer. Did you not do that?
