My fiance insists I get pregnant before he marries me

From a female CFB reader

We've been together for two years and now we are talking about getting married. Only he wants me to get pregnant first. He said wedding preparations will start immediately we find out I'm expecting. I don't know if I'm OK with this. My friends feel its outright disrespectful, saying what it means is that he wants children and not me. I hate that he's insisting I get pregnant first, but i don't want to lose him. What should I do?