Final answer:
The Progestin-only pill must be taken every day without a hormone-free period, providing a continuous dose of hormones to effectively prevent ovulation and thicken cervical mucus in order to reduce the likelihood of pregnancy.
Step-by-step explanation:
The type of contraceptive pill that must be taken every day without a hormone-free period is the Progestin-only pill. Unlike the combined oral contraceptive pill, which typically includes a week of placebo pills to allow for a menstrual period, the progestin-only pill is designed to be taken continuously, with no break.
This method is effective because it consistently provides a dose of hormones to prevent ovulation, and it is also known for causing changes in cervical mucus that make it more difficult for sperm to reach the egg. While extended cycle pills also offer continuous hormone delivery, they still include a hormone-free week every three months. However, the Progestin-only pill does not even have this quarterly break.
The emergency contraceptive pill, also known as the "morning after pill," is not to be used as a regular method of contraception and therefore is not taken daily. Furthermore, there is no such thing as an 'implantable contraceptive pill'; contraceptive implants are a form of long-acting reversible contraception that is placed under the skin and release hormones over time.