Wondering if anyone has experience with being on warfarin and it affecting your monthly cycle? I am 48 years old and had Open Heart Surgery with Aortic Root and Valve replacement Aug 29, 2017 and have been on warfarin since then. My monthly cycles over the past three months have gotten heavier and lasting longer. I take BCP so this should not be happening. Had a inter vaginal sonogram today that showed thick uterine lining. Anyone experience this being on warfarin.