Hello, I am a very late developer...I am turning 15 in 2 weeks and I just started getting brown discharge in my panties. I wear panty liners every day just because of the regular discharge but now it is brown??? I start a swim unit in two days so I’m wondering if i need a pass to get out of swimming? I’m not sure if this IS my period or if it is brown discharge preparing me for my period. I went about 4 hours standing and when i got home my panty liner was filled with the brown stuff...is it my period? Should I get excused from swimming because of this?