How Does The Implant Work?
Your doctor inserts the implant under the skin of the upper arm. It releases what is known as progestin, a hormone known to prevent pregnancy. Progestin thickens the mucus of the cervix and prevents sperm from reaching the egg. Additionally, progestin can also stop eggs from leaving the ovaries during ovulation. If implanted within the first 5 days of your period, Nexplanon is effective immediately. However, it may take up to a week for it to become effective if you choose to get the implant outside of your cycle.