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Why is a 6-week abortion ban nearly a total ban? It's about how we date a pregnancy

The time a person has to decide whether to have an abortion in Florida and other states with six-week abortion bans is at most two weeks. Why? It's has to do with how we date early pregnancy.
The medical community dates pregnancy to the first day of a woman's last period, even though fertilization generally happens two weeks after that. It's a long-standing practice but a confusing one.

Florida's abortion ban after six-weeks gestation is in effect as of May 1. That means the time a person has to decide whether or not to have an abortion in Florida is – at most

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