One possible reason is that an increase in progestin leads to changes in the lining of the uterus, called the endometrium. While bleeding changes and spotting from the birth control pill often get better, it is not clear that they resolve for every person taking the medication.ĭoctors do not fully understand why spotting occurs. As a result, a person may still experience some irregular bleeding between periods initially. It may take time for the pills to regulate the menstrual cycle as the body needs to adjust to the new hormone levels. Spotting often occurs in the first several months of taking a new birth control pill. When a person experiences breakthrough bleeding, their doctor may recommend a different type of pill or investigate other possible causes. The bleeding should decrease and stop after this unless there is another cause. In addition, 10–30% of contraceptive users will experience some bleeding in the first 3 months of use. Research shows that about 40% of people taking the progesterone-only pill will experience breakthrough bleeding at some point.Ībout 27.5% of all contraceptive users in the United States take the combined pill. Some people also take a third option, which is the continuous or extended-release pill.Īccording to The American College of Obstetricians and Gynecologists, about 4 in 10 women who use progestin-only pills keep ovulating. There are two main types of birth control pills: combined estrogen-progesterone and progesterone-only. Anyone who is still experiencing spotting after a few months of taking the pill, or is concerned about the bleeding, should speak with a doctor. Spotting will often subside with the continued and regular use of birth control pills.
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