Is My Menstrual Blood Going to be Pushed Back Up Into My Uterus? The Flex Company September 22, 2020 21:22 Updated Follow Flex Discs will not cause period blood to go back up into the uterus. Have more questions? We've got answers! Feel free to reach out to us at firstname.lastname@example.org Related articles Can I Wear the disc for Longer Than 12hrs? Tilted Uteri + FLEX How long can I wear Flex Disc? Is Flex Disc safe to use? My partner and I can feel Flex Disc during sex. Comments 0 comments Article is closed for comments.