After taking birth control pills, there will be menstrual cramps, if the bleeding is relatively heavy and the cramps are intolerable, you can buy early pregnancy test first to rule out the chances of pregnancy. Because when there is an ectopic pregnancy, there will also be similar to the amount of menstrual bleeding, there will also be dysmenorrhea, because when the fallopian tube rupture will stimulate the pelvic cavity caused by the occurrence of pain. In the absence of pregnancy, contraceptives can change the body’s endocrine hormones to produce some changes, may cause the endometrium to continue to grow, in the menstrual period will cause an increase in the amount of menstruation, at the same time, when the endometrial lining shedding faster, will accelerate the uterine contraction and will cause pain. Oral pain medication such as ibuprofen extended-release tablets or ibuprofen extended-release capsules may be prescribed.