pregnancy
妊 centers on the state of carrying a developing child: pregnancy.
妊 combines 女 (woman) with 壬, which likely contributes the sound and may carry a sense of bearing or containing, together expressing pregnancy.
A woman 女 with a swelling belly 壬 is pregnant.
For ニン, imagine a pregnant woman knitting baby clothes: knitting -> ニン, and the woman 女 is preparing for the baby.
pregnancy; conception; gestation
pregnant woman
contraception; birth control
infertility; sterility; barrenness
trying to conceive; attempting to get pregnant (through various means)
pregnancy; conception
infertility; sterility; barrenness
expectant and nursing mothers
infertility (esp. of animals)
sterilization (operation); sterilisation
infertility treatment
pregnancy resulting from artificial insemination, in-vitro fertilization, etc. (esp. of animals)
induced abortion
contraception
pseudocyesis; false pregnancy; spurious pregnancy; pseudopregnancy
tubal pregnancy
twin pregnancy
multiple pregnancy; polycyesis
male pregnancy (in Boy's Love fiction); mpreg
while pregnant; during one's pregnancy