Is this normal?

I just started my period, today was the 3rd day. I used a thin pad the first day and everything was normal. Yesterday I decided to try out a diva cup and since then, I’ve noticed my blood being very stringy. Like a string of stretchy blood hangs out of me after I remove the cup to empty it and the blood in the cup is also of that consistency. Is this just blood clotting? Is it normal?