To much blood?

OK so I'm not sure how much blood I'm supposed to lose during a period but I feel like I'm loosing way to much I also feel like I'm loosing weight to if that has anything to do with it... Like the last couple days my flow had been really heavy and I have to switch my pad like every 2 hours something like that but every time I go Into the restroom to change it or do my business there's a lot that just goes into the toilet and so much in the pad there's a lot of blood clots too ... Sorry if tmi I'm worried should I see a doctor?? 😧