If you miss a dose of the pill, it is recommended that you take it within twelve hours of the missed dose, as this will not have a corresponding effect on the contraception. If the pill is taken more than two days later, it will have a great impact on the effectiveness of contraception, and if you have sex during this period, the chance of pregnancy is still very high. The pill itself can inhibit ovulation and change the thickness of the endometrium. If you stop taking the pill for two days, it does not achieve the purpose of suppressing ovulation, or the thickness of the endometrium becomes thinner and does not prevent the fertilized egg from being laid, so it may lead to pregnancy. It is advisable to take the pill at regular intervals to make it a habit to reduce the possibility of missing doses.