“Plan B” is not RU-486.
It’s not RU 486, but it is a high dose of birth control that causes the uterine lining to become slippery and stop a fertilized egg (conceived child) from implanting.
That’s one of the issues with it — it does not always stop conception, so it can cause an abortion. Abortion promoters try to deny this by changing the definition of pregnancy to “when implantation occurs” and not when “conception occurs.”
Imagine what this drug will do to the uterine lining of girls who use it multiple times.