Reborn to get pregnant and die: Tips on setting up the Husband with EX

I was a male, but now I am a female, who understands the pain of wearing chest contraptions. Not only that, I was transmigrated into a novel where I am supposed to get pregnant and die. I am the ultimate cannon-fodder! So I came up with the plan to follow the script and directly set my douchband (Husband) with the MC and let them bang each other and live happily ever after. The only problem? The MC fell for me instead... What the heck is wrong with this world? You can't go and change your sexual orientation like that. But the weirdest of all is that my douchband too, isn't bothered about the MC at all.