Brown discharge

Ashh 🍒 • Be happy :-)
Okay so I'm supposed to get my period today, and the last week has thrown me off because I haven't had any pms symptoms at all when I normally would and here I am with no period yet, I still have until tomorrow. Now I noticed instead of blood I have brown discharge and I've been impatiently waiting my period today. I've been working out a lot more lately and I feel that may be why my period is out of whack ( my period has never been late ) I also have been having unprotected sex with my boyfriend and we've been using the pull out method which I'm aware isn't the best and I'm not on birth control so do you think I should take a test to be sure or am I worried for no reason? And if I should what tests do you recommend that you've had the most accuracy?