Like Katrina, I definitely have these too. Sometimes there’s even some solid tissue in there. I often feel like period is mostly clots, especially on the first days of bleeding. My doc said it’s natural for the blood to clot on a period, and it’s usually not something to worry about unless these clots are large and I’m bleeding more than a tampon’s worth every hour. (Heavy bleeding comes with it’s on health issues, like anemia.) If these clots are worrisome to you, or you have other symptoms like serious pelvic pain, I’d definitely bring this up with your doctor. There are tests like ultrasounds that can look at your uterus and ovaries to check for cysts or fibroids that could be causing any issues. I hope this helps! - Keri (endometriosis.net team member)