by Jennifer Parris, July 6, 2021

Depending on the type of IUD you get, you might have birth control protection immediately, or a few days after. “With a copper IUD, they are effective immediately after insertion, since the copper in effect sets up an inflammatory response in the uterus,” Dr. Kecia Gaither, MD, MPH, FACOG, double board-certified in OB/GYN and Maternal Fetal Medicine, Director of Perinatal Services at NYC Health + Hospitals/Lincoln tells Romper in an email. “For a hormonal IUD, the device is effective immediately if it’s inserted within seven days of the start of menses; if it’s not inserted during this time frame, within seven days post insertion it should be effective.”

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