how to retrieve deleted photos in iphone 6S

hi..i was connecting my iphone 6s with my win pc and i was trying to do back up and same time i was viewing newly took photos in my pc by view photos options and i found some bug kind of flies wiht 1kb memory i thought its kind of bugs so i deleted all those files and unfortunately my back up didnt go well because of some memory issue in my win pc..so i disconnected my iphone 6s and viewing in my camera roll all my newly taken pic is disappeared ....is it because i deleted the bug files... wats tht bug exactly ?? is there any options to retrieve all those newly took pics....i tried with different kind of softwares but i coundnt find those pics... can anyone help me ..???