Femvue is performed as part of an infertility evaluation. Your practitioner will place an appropriately sized speculum into your vagina and then thread a small catheter through your cervix. You may experience cramping as a tiny balloon is inflated to hold the catheter inside your uterus. The speculum is removed and a vaginal ultrasound probe will be gently placed. Your practitioner will inject fluid with air through the catheter into the uterus. The air looks like sparkling white lights and we will hopefully see white lights blinking as fluid comes out of your fallopian tubes. This can cause cramping, but is usually resolves quickly.