2-3 weeks back I got an admit from USC for spring-18. I was asked to accept the spring admit 24April

2-3 weeks back I got an admit from USC for spring-18. I was asked to accept the spring admit 24April and they mailed saying possible candidates can be considered for fall-17. Today I got a mail saying "To confirm, we have received your acceptance of your Spring 2018 semester offer at USC." Does this mean I cannot be considered for fall-17?  Anyone else got such confirmation mail who had accepted spring for fall consideration?