I have seen that my rear wheel rim is slightly bent. Can I use it for a week and take to the technician Sunday? Will there be any problem if I ride it for a week?
The bend can't be too bad because it's not visible in the picture.
If the bend is lateral (side to side) and the rim is not hitting the brake pads too hard, it's fine.
If the bend is radial, that might indicate that you hit something pretty hard. If you can't feel it when you are riding it's probably OK, but if you can I would avoid riding on it.
If it's caused by a broken spoke don't ride on it as you'll probably break more spokes.