Polyps, Fibroids and Cancers
A small amount of blood in your cervical mucus may be harmless, caused by hormone fluctuations, or even the implantation of an embryo if you have conceived. But sometimes it may indicate cervical or uterine polyps, or fibroids. There are also a number of cancers of the reproductive system that can affect your patterns of cervical mucus and menstrual cycle. It's important to discuss with your doctor any spotting or blood in the mucus that is a change from your usual pattern, or changes in your normal menstrual flow.