Pari, ideally self attested documents are nothing but a copy of the original documents which have your signature on them. You need to take a copy of the original document, sign on it, scan it and upload the same. But if you have uploaded the original document and have not self attested it, that should not be a reason why your application should be rejected provided the rest of the details have been correct and the application has been duly filled. Neverthless, please reach out to the helpdesk at: pg2020@admission.du.ac.in (mailto:pg2020@admission.du.ac.in)  from the registered email id and check with them if it is ok. If they consider that it might be a problem, the authorities will ask you to fill up a fresh form with different credentials and you can do the same. But most probably, that shall not be a problem because you have uploaded the original documents. But to have an official confirmation, please send them a mail from your Registered email id. They respond within 24-48 hours.