The birth control pill delivers low doses of hormones to the body that stop ovulation and significantly lower the chances of becoming pregnant. Stopping the birth control pill allows the body's hormone levels to go back to normal and begin ovulating again. A side effect of stopping the birth control pill is the increased likelihood of becoming pregnant if sexually active. Women have also noted side effects from the changing hormone levels.

Cycle Stops

One side effect of stopping the birth control pill is a stopping of the menstrual cycle. Taking the birth control pill regulates the time and length of the period with low doses of hormones. Once the hormones are gone, it could take an abnormally long time to begin a normal menstruation cycle. Some women note up to three months or more before they resume having a regular period.

Irregular Periods

Since the birth control pill regulates the duration and time of the menstrual cycle, one side effect of stopping the pill is infrequent or unpredictable periods. The body is no longer getting a regulated dose of hormones but producing its own hormones. This can change the flow of the period as well as its monthly cycle.

Increased Moodiness

Some women have noted that feelings of depression increase after stopping the birth control pill. The withdrawal of the hormones may cause symptoms such as increased irritability, crankiness, anxiety, and moodiness.

Oily Face

Some birth control pills like Ortho Tri-Cyclen and Yaz are noted for their ability to decrease facial oil. Once the pill is stopped the normal levels of oil will resume, which can lead to breakout of facial blemishes such as blackheads.

Sex Drive

An increase in sex drive is a side effect that has been noted. In some cases sex drive is altered by the extra hormones in the birth control pill, and stopping the pill will result in a normal sex drive resuming.

Source:

MayoClinic: Birth Control Facts

Reports of Birth Control Side Effects