Um I have had blood come out on tiolet paper but I don't know where period blood is ment to come out of I really don't wanna tell my mum it comes out on toilet paper but not in my underwear the blood I speak of comes out around the middle should I tell an adult or is it just the blood that comes out of your bum
Period blood comes out of your vagina. In simple terms, when the womb has made itself ready for pregnancy, and pregnancy does not occur, the womb then gets rid of those 'preparations', and so blood is discharged through the vaginal canal. Blood should not come out of your bum.
Why don't you want to tell your mum? She should understand what is happening to you, and help. Where are you from? and how old are you?
If you want more detailed help on the subject of how your body works, don't be afraid to ask. If I've used terminology you don't understand, or have misunderstood what you meant, feel free to ask again.
I hope this helps as a start.