The Pill is a combined oral contraceptive pill, which contains two hormones: estrogen and progestin. The primary mechanism of action includes inhibition of production of certain hormones in the body which are needed for ovulation.
The recommended dosage for The Pill is one tablet daily for three weeks. It is very important to take the pill at the same time every day. Otherwise, the effectiveness of protecting you from unwanted pregnancy might be significantly reduced. The Pill is usually started on the first day of your period. After 21 days (3 weeks), you either stop taking them for one week or keep taking pills that do not contain any hormones (which one that will be depends on the package).
However, taking a hormonal contraceptive might be accompanied with certain side-effects. So, you might want to talk to your gynecologist to check whether the missing period is really caused by taking Depo provera (generic name: medroxyprogesterone) or something else caused the missing period. If another cause is diagnosed, your doctor might conclude that The Pill is no longer an oral contraceptive that is suitable for you. As you can see, whether or not you take The Pill depends on the cause of the missing period that has to be determined before proceeding with The Pill.
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