The birth control pill taken half an hour after the internal injection, the birth control pill taken at this time should be referred to as emergency contraceptive pills, which generally will not be pregnant, but can not be completely ruled out.
Emergency contraceptive pills are used for women’s emergency contraception, i.e., when unprotected or other contraceptive methods fail by chance. Taken within 72 hours after intercourse, the sooner you take the better, the product can be taken at any time during the menstrual cycle, so the birth control pills taken half an hour after internal ejaculation will generally not be pregnant, but not 100 percent work.
But emergency contraceptive pills will affect the endocrine, may affect the normal cycle of menstruation, may also lead to irregular vaginal bleeding, so you can not take emergency contraceptive pills, as a common contraceptive measure.
If the patient’s menstrual period is delayed for more than a week after taking the pill, the possibility of pregnancy needs to be considered, and a timely visit to the hospital is needed to clarify.