Hi I'm Gaby and like 3 weeks ago I got this dark brown discharge and it was a lot so I wore a pantyliner then like 1 hour later I went to the bathroom and checked and there was a huge mark (brown discharge) on it HELP!! If it is my period why has it been like a month ago?? Please HELP ME?

If you are worried, go and see a doctor.
Blood can only hold oxygen for a few days. After that, it becomes brown, and is called deoxyhaemaglobin. Normally the brown discharge comes when the period is almost over. It's nothing to worry about.
If it happens ongoingly, then seeing a doctor would be the best option.

Old blood will often appear brown, and spotting is fairly common at times in women.

How old are you, are you familiar with periods and women cycles ?

Old blood will often appear brown, and spotting is fairly common at times in women.

How old are you, are you familiar with periods and women cycles ?

I'm 12 years old