I started my period on Friday and had quite bad cramps which I didn’t think anything of but the nezt

Morning I woke up and I had bleed an extremely large amount (enough to soak through my pad, underwear, pants and onto the sheets) which has never happened nor have I ever experienced such heavy flow before and I went to the bathroom and noticed I passed a clot the size of my palm - again which has never happened to me.

Does anyone know what this could be? Or is it normal?