Someone explain this to me

[Chisengan11]

So Sakura is the mom and sasuke knocked her up when all 3 of them were traveling together? Also why did the machine say Karin's DNA?

 

[Ashura Hagoromo]

It didn't say karin's DNA it said "DNA match"

 

[ichigo uchiha 1992]

It was sarada and sakuras embalical cord
Only Sakura and Karin were traveling together looking for sasuke to tell him she was pregnant