That often depends whether this camera memory card has been overwritten with anything new since then. If you have, perhaps, part or even all of your original photos may be lost forever. But, if not, you may also have chances to get them back with card data recovery software.
Therefore, to increase the chances of successful data recovery, stop using this camera card, insert it to computer and try data recovery software to see how many of your original photos could be restored. There are many similar data recovery programs that can help you, like Recuva, EaseUS Data Recovery, 4Card Recovery, iCare Data Recovery Free and more.
Never try to delete anything important without card data backups again in the future.