I filed and my return was accepted by the IRS on April 13th. I paid the extra $35 for up to 5 days earlier. It is now May 8th. Where is my refund?

What do you see at the IRS "Where's My Refund" tool?

https://www.irs.gov/wheres-my-refund
See what is displayed there about your refund.

Here are some tips when using the IRS "Where's My Refund" tool:

• If you efiled, be sure you have waited at least 24 hours after acceptance before using the IRS WMR tool.   If you mailed a paper return, it won't show up in the tool for at least 4 weeks or longer.
• Be sure you enter the correct tax year, SSN and filing status.
• Be sure you are using only the Federal refund amount.   Do not include any state refund or any total refund or net refund (Fed and State) that TurboTax may have provided on a screen.  
• Look at your actual Federal return to get the Federal refund amount, i.e., your Form 1040, Line 35a.