INDIANAPOLIS — Nic Fink spent the final hours of a perfect soon-to-be-Father’s Day qualifying for the Olympics, celebrating and reflecting. Seconds after touching first in the 100-meter breaststroke here at U.S. swimming trials, he found his family, mimed rocking a baby, and broke into a proud grin. Hours later, he spoke about his pregnant wife, their incoming baby boy, and life as a utilities engineer and an Olympian. He was asked about balance, about resiliency, about race strategy, about marriage — and then, with the final question of the night, about a Chinese doping scandal.