I think u should tell ur parents this happened to my older sister couple yrs ago the dictirs said it was bc of her hormones but not every girl is the same. Just ask ur mom if y'all can talk privately and tell her tgt ur periid been going on for a whole month.
You may be scared but it's better than getting internally hurt.Im about your age and yes it's weird but it's worth it.
You need to visit a doctor. That's way too long, in my opinion. That's a lot off blood loss.
No hun you need to be telling your mom.