Hey girl!! You are A-OK, don't sweat it!! :)
Good, I'm glad you've been wearing something!! Is this your very first period?? Have you told your mom??
As MC said, yes, period blood can be brown. Infact, for the first day of my period, mine is generally brown- no idea why, but it is older blood. If you cut yourself and bleed on something, after a while you'll notice it will turn brown as it gets older (don't do that though oml -_-). But don't worry, it is totally normal!! Is this your first day with your period?? 'Cause it might get redder in a day or two. Also, it might be like that for a few months if this is your very first- that's what happened with me.
Lmk if you have any more questions!! Don't worry dawg, you've got this :)))
Best of luck!! :D