Okkkkay so... Not sure if I should be worried? I didn't have a more than normal active day today…

Okkkkay so... Not sure if I should be worried? I didn't have a more than normal active day today just went did some shopping walking around for a few hours ect. I just went to the bathroom, when I'm out I wear a panty liner so I still had one on and it has like brown discharge in it.. I haven't had anything at all like that just normal discharge so I called the after hours line and talked to some guy I've never talked to and he said to take it easy and see what happens and stuff.. He didn't seem concerned or maybe it's nothing to be concerned about? Can someone help me or tell me if this has happened to you?! Please !