The following link will give you information if you are accepted but not approved and whether you should be worried:
https://ttlc.intuit.com/questions/2724106-my-return-is-accepted-but-still-not-approved-is-there-a-pr...
Another possibility could be If
you have claimed the EITC or ACTC, the IRS expects the earliest EITC/ACTC related refunds to be
available in taxpayer bank accounts or debit cards starting Feb. 27, 2018, if there
are no other issues with their tax return. See below for further
information:
https://www.irs.gov/individuals/refund-timing
