The IRS says 9 out of 10 filers who efile and choose direct deposit will get their refunds within 21 days. That still leaves a considerable number of people who do not. Some returns take longer for additional processing due to specific items in the return. Some are pulled at random for more thorough investigation.
Did you efile, or did you print, sign, and mail the return?
If you efiled, double-check with this tool to be sure the return was efiled successfully and accepted:
https://shop.turbotax.intuit.com/efile/efile_status_lookup.jsp
If that showed it was accepted, what do you see at the IRS website below for the status of your Federal refund?
https://www.irs.gov/Refunds
If the IRS tool says it is still "being processed", if it goes longer than 21 days, we can tell you how to speak to a live agent at the IRS to see if they can tell you anything about the delay. There's no point in calling them prior to 21 days.
To track a state refund:
https://ttlc.intuit.com/questions/1899433-how-do-i-track-my-state-refund