I don't know if all of you are aware, but there is an awesome birth control method via an IUD that changes uterine lining to prevent implantation. The awesome part about it for women is that it eliminates periods. No need to take a pill, no need to remember anything, no more periods.
http://americanpregnancy.org/preventing-pregnancy/intrauterine-devices/
So basically it makes the uterus impossible for a
fertilized embryo to implant itself in and grow. So with this birth control method, conception can occur, basically every month it's possible. A sperm and an egg meet, cells begin dividing, the embryo is developing, implantation fails, embryo stops growing.
For some of you, I imagine this amounts to killing a child every single month.