Should I be panicking?

Yesterday when AF showed up 4 days early, I didn't think anything of it. But this morning when I woke up, I was nauseous, and abnormally tired. Went to the water closet and when I sat down to pee it felt like a shooting pain for about 5 seconds and I passed a blood clot easily the size of my palm.. Which is big but still. I've been having little clots since yesterday but this one was huge!