Wierd period???

Hi so I usually spot right before my period pink the a little brown and then regular dark red but this time it was pink spotting then barely any brown like only enough to color some discharge and now the bleeding is very bright pinkish red the bleeding itself is light and it's mostly clots not big ones but I find it wierd that it's mostly clot than actual bleeding and the color of the bleeding is strange to me and the cramping hurts a lot it's ok during the day but when I go to bed it's so bad it goes into my lower back and I can't sleep my heart starts going faster with the pain not sure what's going on has anyone else experienced this?