Hi, Strong vaginal odor during periods can be caused by several factors, including bacterial vaginosis, poor hygiene, hormonal changes, and infections. While the Nexplanon implant may not directly cause vaginal odor, it can potentially contribute to hormonal changes that may increase the risk of developing infections such as bacterial vaginosis. It is important to maintain good hygiene, especially during your period, to reduce the risk of developing a vaginal odor. This includes changing your tampon or pad frequently, washing the genital area with mild soap and water, and avoiding scented products that can irritate the vagina. If the odor persists or is accompanied by other symptoms such as itching or discharge, it is important to see a healthcare provider to rule out any underlying infections or conditions. They may recommend antibiotics or other treatments to help manage the odor and improve overall vaginal health. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician