I went to the bathroom last night and there was some brown liquid (but it wasn't runny and it stayed in my underwear). I thought it was my period because I haven't started and I'm 14, but then when I woke up this morning the pad was clean. It showed up on the pad last night but on the new one it's completely clean. What does this mena? Women only please!

Most likely it means you are about to start your period.

Menstrual blood includes tissue, the lining of your uterus that sloughs off every period, so you will see it vary in thickness from day to day and month to month. It's brown from exposure to air.