When a period is late, the 2 likely causes are either that you're pregnant or that you didn't ovulate.
Without a pregnancy test, it's hard to know. If it was a pregnancy, then the bleeding might mean a possible miscarriage.
I think that it's more likely that you didn't ovulate since your last regular period. Not ovulating is common, often due to stress, but also from other things.
It doesn't sound like this is a normal period. That makes me suspect that it's likely that you haven't ovulated since your last period. When that happens, the uterine lining can get built up too much, and that can lead to bleeding. If that's the case, then the bleeding may go on for a while.
Unless you think that this really is a normal period, I would recommend seeing your doctor, especially if the bleeding continues.
Your doctor can help to be sure whether you're pregnant, and if not, can give you some progesterone pills that would help the bleeding to stop.
If you wish to become pregnant, your doctor can also help figure out whether you're ovulating most months, and help if you're not. Best wishes.