Hi,
I normally have a period every 5 weeks. Today I started bleeding which when I’m due on, so I popped my cup in and away I went.
At tea time I had really bad cramps so I went to the loo to empty said cup.
Expect it was proper period blood. It was extremely stringy/mucusy, and a lot of discharge! 
My period has practically gone but I’m cramping and losing a lot of tinged discharge still.
It’s never like it, I have the copper coil so my periods are usually really really heavy and clotty.
What could it be?