Combined oral contraceptive pill
If a woman misses more than one active pill in a packet. (Certain packets also contain "placebo pills", which do not have any hormones in them. COCPs are usually used for three weeks out of the month. The woman then takes a break from the pills for a week. Some packets have placebo pills for women to take during this week, so that the woman does not get out of the habit of taking a pill evey day. If a woman does not take placebo pills during this week, it does not make her more likely to get pregnant.)