I need some advice

I started my period two days ago. I wasn't concerned with the unbearable cramps because I have terrible periods every month. Usually with a few blood clots but nt bad ones. But yesterday on the second day of my period I felt something like a clot come out of me while i was at work. I went to the bathroom to change my pad because I figured if it was a clot it would need to be change. When I went to change it I found a oblong mass that was whiteish and firm (I poked it to see if it was just mucus) about two centimeters long. Now not even five hours later I have hardly any blood at all. As if I were at the very end of my period. But a feeling of weight in my uterus. What do you think the clot could be? I've done some search and I can't find anything other than early miaca, which I really hope it isn't. So any other ideas?