The morning after pill is a pill that contains certain hormones and is used immediately after intercourse or up to twelve hours afterwards. If used afterwards, the effectiveness might be decreased, but there is still a certain amount of effectiveness.
The light bleeding 3-4 days after the morning after pill might be expected due to the hormonal changes the pill causes. Therefore, there is a high probability that the pill was effective and that no pregnancy has occurred.
However, there is always a small possibility that the pill was not effective even if it was taken properly. So, if you want to be completely sure, you are advised to visit your gynecologist for an ultrasound scan and a physical examination. The hormonal tests would not be conclusive in your case, because you already use a birth control pill which releases hormones in the body.
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