I don't know what this is that came from me last night.

I'm in my final days of my cycle (which is a very irregular cycle) and when I wiped, this came out. I told my husband and we're going to set me up with an appointment as soon as I can but I can't stop wondering what this is. I want to keep it to show to a doctor but don't know how soon I can get in and don't want to keep this around (for obvious reasons even though it's in a paper cup) but this does have me a bit nervous. The three photos are a side view for thickness, the top, and the bottom. (Don't mind the tooth picks. That's how I moved it and it's how I kept it in there when I rinsed this off). Thank you.