Its okay. You don't have to be sorry about that. Its just my personal preference to use scaled up images for pixel art. I believe most pixel-art art editors have an in-built option to change resolution while exporting. I know pixel studio, the software I use, has one. I'm not sure about other applications.

Here I blew it up for you. there is usually an export function for these programs that contain a resize function. the program I use (aseprite) does it by percent. It looks like this:

I did 600 percent which increased it by about 600 pixels to height and width.

The best part is the export is a separate file and won't overwrite the source (you want to keep the source in the original size for you project)