Timing of LNG-IUD Insertion and Ovarian Cyst Formation

This study looks at whether the timing of when a hormonal IUD (a small device inserted into the uterus that releases a hormone called levonorgestrel) is placed affects the chance of developing ovarian cysts afterward. It aims to find the safest time in a woman's menstrual cycle to insert the device. **You may be eligible if...** - You are between 18 and 45 years old - You have a medical reason for needing a hormonal IUD (such as heavy periods, painful periods, endometriosis, or abnormal uterine bleeding) - You have not used oral contraceptives (birth control pills) for at least 3 months - If you had a previous IUD, it was removed at least 1 year ago - You have no contraindications to an IUD (no suspected pregnancy, serious uterine abnormalities, or active pelvic infection) **You may NOT be eligible if...** - You are currently pregnant or have recently been pregnant - You are using hormone therapy - You have adnexal masses (growths near the ovaries) - You have severe uncontrolled health conditions (uncontrolled diabetes, heart disease, advanced liver or kidney failure, or active cancer) - You have a history of breast cancer or severe liver disease - You have psychological disabilities Talk to your doctor to see if this trial is right for you.