If you missed a pill, or varied that time more than 3 hours it can create breakthrough bleeding the rest of the pack. If you are on antibiotics(or possibly other medications can cause this as well) you may not be absorbing you are pill completely and this can also lead breakthrough bleeding. remember if you're not taking her pills timely, correctly, or on antibiotics, your protection from pregnancy is also not as good and you should be using condoms or other methods of back up birth control in these scenarios.
Occasionally light bleeding, spotting, or menstrual-like bleeding can occur in early pregnancy, so any time to have abnormal bleeding on the pill I encouraged you to check a pregnancy test. Although if you are taking the pill correctly you are 98-99% protected against pregnancy, so this is unlikely but important to exclude.
If you have been on the birth control pill long-term, your uterine lining can become thin in that can also be a cause of recurrent breakthrough bleeding.sometimes increasing the dose of your pill, or going off the pill for a few months we'll remedy breakthrough bleeding in this scenario.
The lower the dose of your birth control pill the more common the breakthrough bleeding, so if you are on a low dose of a 20 or 30 mcg pill sometimes going up to the next dose will be helpful.
If you take her pills correctly this will also minimize the issue.
My advice if the pregnancy test is negative and you are taking the pill correctly in a timely fashion and breakthrough bleeding persists to see your doctor for evaluation. If pregnancy test positive contact your doctor right away!
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