I went to the bathroom and saw there was some light brown stuff mixed in with the usual yellow stuff

So one morning I woke up and I went to the bathroom as usual and saw there was some light brown stuff mixed in with the usual yellow stuff(this was on my underwear) but I ignored it because I hadn’t takin a bath in like 4 days . I wiped myself but nothing showed in the toilet paper it was only on my underwear.The next day I saw I hade more of the brown stuff so I told my sister she said I’m gonna get my period soon so I decided to tell my mom.I told my mom and she said the same thing sooooo I asked my aunt (she’s a medical helper) and my aunt said that’s my first period. (Mines was light brown and dried up) is it really my first period?) (oh and I had this for 2 days)