Some people had this concept a few years ago. However, it is yet to hit the market as the science is quite complicated; you would have to place STD antibodies in the condom for the test to work. Check out this CNN article here on the idea. https://edition.cnn.com/2015/06/24/health/condoms-change-color/index.html

Condom that detects STIs thought up by teens - CNN

Link: https://edition.cnn.com/2015/06/

The “S.T.EYE” condom changes color when it comes into contact with a sexually transmitted infection such as chlamydia or syphilis.