It's too late now to stop it.
You have to go through the interview in order to be sure it asks you everything. If you skip around any, you can miss something.
If you already efiled, then cross your fingers and hope that the return will be rejected when the IRS starts processing returns on January 23. If it rejects, you can just correct everything and resubmit the efile. If the IRS happens to accept it, however, then you'll need to file an amended return Form 1040X when TurboTax amending process opens up.
