As the egg implants into your uterine lining, it can cause irritation and bleeding. Increased blood flow to the uterus during early pregn

What is implantation bleeding? Characteristics, signs and symptoms

3 Ways to Recognize Implantation Bleeding - wikiHow

Pregnancy Symptoms Week By Week: Guide to Pregnancy Stages

Patient education: Abnormal uterine bleeding (Beyond the Basics) - UpToDate

What Does Spotting Look Like?

Menstrual cycle - Wikipedia

Abnormal Uterine Bleeding (booklet)

Embryo Implantation - StoryMD

What is the difference between periods and spotting