Ladies: 8 Reasons for blood in your panties other than your period

Taking a blood thinner like Warfarin? “Typically, any kind of blood thinner can cause periods to be heavier and cause bleeding,” says Johnson. Supplementslike ginkgo biloba also have blood-thinning properties that could affect your flow, adds Mamik. Of course, even birth control options like the NuvaRing, which contains estrogen and progestin (and alters hormone levels), could be the culprit, notes Johnson. So if you just started a new prescription and notice symptoms, mention that to your doc.