I'm not trying to have TMI but I'm curious to why I have a slightly Brown discharge I'm supposed to…

I'm not trying to have TMI but I'm curious to why I have a slightly Brown discharge I'm supposed to start my monthly on the 23rd? Is it a good thing (pregnant) or does it mean that's normal to have before your monthly comes? Only reason I ask me and my fiance really want a baby esespecially my fiance he's all asking me how mu body feels to see if I'm pregnant or not lol then get sad once i have my monthly.