Strenuous exercise is not recommended after taking the emergency contraceptive pill, otherwise it may aggravate the adverse reactions after taking the pill. The main ingredient of the emergency contraceptive pill is levonorgestrel, which is a potent progestin drug, because after taking it, women may experience nausea, dizziness, vomiting and other adverse reactions. If you take the emergency contraceptive pill after strenuous exercise, it is likely to lead to the aggravation of the above adverse reactions; if there is severe vomiting, it will also affect the effectiveness of the drug, and ultimately lead to contraceptive failure. It should be noted that the emergency contraceptive pill should not be used as a regular contraceptive method, and regular use of the pill will be more harmful to health, which will easily lead to menstrual disorders, prolonged menstrual period, etc., and in serious cases, it may also lead to infertility.