Weird conversation during sex *tmi maybe*

Simran • 18

My boyfriend and I were having sex, he finished inside me but I still wanted to go for a second round immediately. I didn’t go to bathroom after our first round of sex and let his cum drip out, we just went in for our second round. As I was trying to put him back inside me, he whispers that “I was trying to have his baby”. Is this a red flag? Is he trying to have a baby with me or is he one of those guys that don’t give a shit about what happens?