what could be going on??? (EXPLICIT PHOTO OF BLOOD CLOT)

Last month I had my period and it felt fine then one day I felt something come out my vagina and it didn't feel like blood so I ran to the bathroom and it was a blood clot that was probably the size of a normal human finger and then after my period stopped and didn't really think nothing of it then this month I started my period and it started fine then randomly stopped after 2 days but I was still have like a dark very lil discharge that look like a little by of old blood and just now I felt like my period came rushing back and rushed to the bathroom and this came out and it's bigger than the last clot and I'm freaking out of what it is and why is this the second time a big clot has came out of me???