Jongin knew they’d used protection; vividly remembers Kyungsoo putting it on (or rather, he remembers putting it on Kyungsoo, but that's beside the point). He was a gazillion percent sure that there was no possible chance of conception—because they’d used contraception… It just wasn’t possible.  

Jongin's pregnancy goes easier than expected, though there are a few rough patches here and there. 

~ Just a normal day of DoKim family ~ In which Jongin's mad at Kyungsoo for bringing home another cat's smell