Awasome When To Start Birth Control References. You can begin taking birth control pills in three different ways: At the same time, the pill thickens the mucus of the cervix, which makes it difficult for sperm to get past the cervix and into the fallopian tubes, where fertilization occurs.

At the same time, the pill thickens the mucus of the cervix, which makes it difficult for sperm to get past the cervix and into the fallopian tubes, where fertilization occurs. This is the beginning of a period when bleeding usually occurs for around 4 to 8 days. Web when can you start using birth control pills?