Hello! I need some help. I am having a period 11 days after my last one. Generally my periods are consistently heavy and remain a normal distance apart with little to no old blood. This period is medium flow of old blood with some normal blood mixed in. Today however, I passed a “clot” that looks a lot larger and is more firm than normal. My sister who is a nurse thinks it looks like tissue. I cannot be pregnant, and do not use tampons. If I press down on it (with toilet paper) it feels hard. What do you think this could be?

*If I have anymore like this I will see a doctor.