PREGNANCY SCARE?!??

So my period is supposed to be starting here soon (not really sure what day bc i suck at logging the days) but instead of my period i’ve been having this brown discharge. And that wasn’t alarming to me at first at all bc i figured. my period was starting, but this brown discharge has been happening for the past 2-3 days and i don’t have any pain and the only explanations that i’ve been getting are PREGNANT. My boyfriend and i had sex but i don’t remember when but i know it was between this time and my last period. I’m pretty sure this isn’t a yeast infection or anything either bc it doesn’t hurt to pee and it doesn’t hurt during sex. I’ve had slight itchiness but nothing major. Anyways if someone could give me an answer that’d be great bc i’m freaking outttttttt.