Obviously YOU fantasize that all women WANT to be mothers. Too bad for you that this isn't the case.You fantasize that trees "live off dead organisms". You fantasize that people will believe you are a woman just because you were a dress.
Pregnancy and children are NOT desired by all women, and each woman can cheerfully reject motherhood if she doesn't want the hardships and responsibilities it involves. A number of women (and men too, of course) have decided not to have children at all, which is their right. Some of us, myself included, have just ONE child by choice, and have NO desire or intention to have more kids.
Again, motherhood is OPTIONAL, not required, even if a pregnancy happens. Basically that means a woman can decide NOT to continue a pregnancy simply because she DOESN'T want to be a mother. Get over it.