Can I reuse a condom?

You can't reuse a condom as they're only designed for a single use.  Although the condom may look perfectly fine after use, they're often prone to splitting, and the holes are very difficult to see with the naked eye.

In that case, you'll be putting yourself and your partner at risk of an unwanted conception and  sexually transmitted diseases.  There are also risks of new condoms failing to work correctly.  Figures suggest that 2% of condoms used correctly will fail for people who use them regularly.  Staggeringly, 18% will fail when used incorrectly.

Other contraceptive methods

If you're worried about the effectiveness of condoms, there are other contraceptive methods available, including injections, implants, intrauterine device, pills, and many more. 

Ultimately, you should never try to reuse a condom.  There is a high risk that it will not be suitable for use, and it's not fair to your partner, yourself, or the child that's potentially born from a lack of proper protection.