Our expert says:
The Pill works by suppressing ovulation. For it to do this, you have to take it every day. In the placebo week, you do not take active pills and follicles start to grow. In most cases, ovulation will not occur by the 7th day when you restart the active pills. Some of the low dose pills have only 4 days of placebos as ovulation can occur after 4 days off the Pill. When you take antibiotics, it is the same as not taking the Pill. If this goes on for more than 7 days breakthrough ovulation can occur. This can happen even if you have just had a period.
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