Quoting Jennybananna:" Go to the ER now. Clots larger than a golf ball and soaking through a pad in an hour or just gushing blood is way to much. "
Also, go look in the mirror. Press your thumb onto your upper cheek (where the cheekbone is) for a few seconds and pull away. Do you see a "thumprint" there, where there is no blood? It may look pale, dark in color... anything but red or pink? If so, that is a quick test to show you are anemic. If you do the thumbprint test then you know you are really anemic... go to the ER.
I could have died when I was so severely anemic from blood loss, I lost blood clots the size of my hand... I let it go on for weeks. I ruined so much clothes. I soaked through two pads staked WITH a super tampon in an hour. I was smurfing SICK and was so scared of going to the doctor. Had I gone to the doctor I could have maybe avoiced the hospital, but I ended up needing surgery. It took almost a year to recover from being that anemic. Don't be dumb like me... go to the ER. Especially if you do the thumb test and it shows you are anemic.