What cause a period while on the pill and not time?

Spotting or breakthrough bleeding may occur during the first few months of pill use, especially if the pill is not taken exactly as directed. However, spotting while on the pill and not time may also be caused by:

* Hormonal changes: The pill works by preventing ovulation, but it can still cause the uterine lining to build up and shed, which can lead to spotting.

* Medication interactions: Some medications, such as antibiotics, can interfere with the effectiveness of the pill.

* Medical conditions: Certain medical conditions, such as uterine fibroids or endometriosis, can cause spotting while on the pill.

* Pregnancy: Spotting can also be a sign of pregnancy, even if you are taking the pill.

If you are experiencing spotting while on the pill, talk to your doctor to rule out any underlying causes.