It is always advisable to carry the original certificates and documents while attending an interview, however it is understandable that sometimes unforeseen circumstances may arise and one may not be able to. It is best to inform the concerned authorities in advance, which is what you have done. It is unlikely to have any significant impact on the outcome of the interview. What really matters is your skills, experience and qualifications, which are evaluated during the interview. So, focus on preparing well for the interview and showcasing your best self. Good luck!