You cannot e-file an amended return, it has to be mailed.  You cannot file an amended return until your return has been accepted.  You can check your e-file status to see if your return has been accepted yet.

How do I check my e-file status?

https://ttlc.intuit.com/community/return-status/help/how-do-i-check-my-e-file-status/00/25538