No one but the IRS can answer that. TurboTax does not get any information about your refund after you file your tax return. If you filed your 2017 return in 2018, what did it say when you tried to track it then? Or--did you just file it recently by mailing it? No one has access to your account, so we do not know how or when you filed 2017. If you used online TT, what does it say in your account? Does it say "accepted" "rejected" "printed" or "ready to mail?" If it says anything other than accepted it was never filed--unless you personally printed it and mailed it in an envelope.
If it was not filed, then you need to print it now and mail it in.
If it was filed and accepted but you did not receive your refund:
To call the IRS:IRS: 800-829-1040 hours 7 AM - 7 PM local time Mon-Fri
Listen to each menu before making the selection.
First choose your language. Press 1 for English.
Then do NOT choose the first choice re: "Refund", or it will send you to an automated phone line.
Instead, press 2 for "personal income tax".
Then press 1 for "form, tax history, or payment".
Then press 3 "for all other questions."
Then press 2 "for all other questions." It should then transfer you to an agent.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**