Should I be concerned that it has been a week since I filled and it hasn't been accepted by the government?

[LinaJ2018 · Accepted solution]

No, not at all.  "Pending" means your return is on its way and in the queue waiting for the government to accept or reject.  Due to the January Government shutdown and existing tax code changes, the  process has been just very slow.  IRS is trying to process and approve as quickly as they can but it is not moving as fast as we wish.