Why would you trick your partner into getting you pregnant?

em
What I really don't understand about some women on this app, is that they're willing to trick their men into getting them pregnant just because they want a child?? Children should only happen when it's something that both parties want, and consent to. That's what I believe anyway.
But so many women willingly want to trick their partner into getting them pregnant for their own selfish reasons.
Like why?
What could go through your head to do that??