Menstrual Clotting

I am on my 3rd day of my period. I was kinda shocked to see no blood or even spotting on the pad I was wearing when I woke up this morning considering it's a SUPER heavy flow this month. I am a cake decorator, and while working on my last cake, I felt some pretty intense cramping all of a sudden and then a gush. When I finished the cake, I went to the bathroom and sure enough, it was about a silver dollar sized clot and since that passed, it's a very heavy flow again. Been cramping since it happened too. There is no chance of pregnancy, last time I had sex was beginning of july and this is my 2nd cycle since then. Do you think it's worth getting checked out? Keeping an eye on it.